1571
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 1572
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1570
- Möbius Function
- -1
- Radical
- 1571
- 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
- 122
- 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
- 248
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Prime numbers of measurement.at n=37A002049
- From a Goldbach conjecture: the location of records in A185091.at n=10A002091
- Coordination sequence T1 for Zeolite Code ACO, ASV, EDI, and THO.at n=28A008084
- Coordination sequence T2 for Zeolite Code STI.at n=27A008235
- Coordination sequence T4 for Zeolite Code CON.at n=28A009871
- Expansion of x/(1 - 5*x - 11*x^2).at n=5A015547
- Primes that are palindromic in base 2 (but written here in base 10).at n=13A016041
- Numbers k such that the continued fraction for sqrt(k) has period 22.at n=34A020361
- Smallest nonempty set S containing prime divisors of 10k+1 for each k in S.at n=36A020632
- Numbers k such that k and 8*k + 1 are both prime.at n=44A023228
- Primes that remain prime through 2 iterations of function f(x) = 6x + 5.at n=51A023257
- Primes that remain prime through 2 iterations of function f(x) = 9x + 4.at n=28A023266
- Primes that remain prime through 3 iterations of function f(x) = 9x + 4.at n=10A023297
- Coordination sequence T3 for Zeolite Code IFR.at n=28A024984
- Numbers that are the sum of 3 nonzero squares in exactly 9 ways.at n=36A025329
- A B_2 sequence: a(n) is the least value such that sequence increases and pairwise sums of elements are all distinct.at n=32A025582
- Index of 4^n within the sequence of the numbers of the form 3^i*4^j.at n=49A025701
- Index of 10^n within the sequence of the numbers of the form 5^i*10^j.at n=46A025743
- Numbers k that divide the (left) concatenation of all numbers <= k written in base 11 (most significant digit on left).at n=14A029480
- Primes with property that when squared all even digits occur together and all odd digits occur together.at n=21A030480