16369
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 16370
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 16368
- Möbius Function
- -1
- Radical
- 16369
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 66
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1899
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Eulerian numbers (Euler's triangle: column k=2 of A008292, column k=1 of A173018).at n=14A000295
- a(n) = ceiling(n*phi^15), where phi is the golden ratio, A001622.at n=12A004970
- Incorrect duplicate of A297408.at n=8A007355
- Odd numbers in the triangle of Eulerian numbers.at n=50A014459
- Odd numbers in the triangle of Eulerian numbers that are not 1.at n=24A014461
- Odd numbers in the triangle of Eulerian numbers that are not 1.at n=29A014461
- Triangular array formed from odd elements to right of middle of rows of the triangle of Eulerian numbers (A008292).at n=26A014469
- Triangular array formed from odd elements to right of middle of rows of the triangle of Eulerian numbers that are greater than 1.at n=14A014470
- Numbers k such that the continued fraction for sqrt(k) has period 61.at n=25A020400
- Convolution of odd numbers and A000201.at n=30A023658
- Distinct elements occurring in triangle of Eulerian numbers (sorted).at n=19A030196
- Numbers whose set of base-11 digits is {1,3}.at n=36A032918
- Numerator of Sum_{i=1..n} i/2^i.at n=13A036295
- Prime numbers in the triangle of Eulerian numbers.at n=3A065050
- Odd prime values of sigma(k) - phi(k) taking k in increasing order.at n=44A068419
- Prime numbers occurring at integer Pythagorean distance (radius) from 1 in Ulam square prime-spiral. Primes on axes are excluded.at n=26A078765
- Sum of first n 6-almost primes.at n=31A086052
- a(n) = index of the first occurrence of n in A088606.at n=41A088757
- Numerator of the probability that the sum of n uniform picks on [0,1] is first greater than 2 (i.e., the sum of n-1 is not).at n=14A090137
- Primes p such that the sum of the digits of p is not prime, but the sum of the squares of the digits of p is prime.at n=25A091362