56172217 has 8 divisors (see below), whose sum is σ = 59984640. Its totient is φ = 52484880.

The previous prime is 56172203. The next prime is 56172223. The reversal of 56172217 is 71227165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56172217 - 2⁷ = 56172089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56172247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30343 + ... + 32140.

It is an arithmetic number, because the mean of its divisors is an integer number (7498080).

Almost surely, 2^56172217 is an apocalyptic number.

It is an amenable number.

56172217 is a deficient number, since it is larger than the sum of its proper divisors (3812423).

56172217 is a wasteful number, since it uses less digits than its factorization.

56172217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62543.

The product of its digits is 5880, while the sum is 31.

The square root of 56172217 is about 7494.8126727758. The cubic root of 56172217 is about 382.9780248125.

The spelling of 56172217 in words is "fifty-six million, one hundred seventy-two thousand, two hundred seventeen".