56172905 has 4 divisors (see below), whose sum is σ = 67407492. Its totient is φ = 44938320.

The previous prime is 56172889. The next prime is 56172917. The reversal of 56172905 is 50927165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39980329 + 16192576 = 6323^2 + 4024^2 .

It is not a de Polignac number, because 56172905 - 2⁴ = 56172889 is a prime.

It is a super-2 number, since 2×56172905² = 6310790512278050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5617286 + ... + 5617295.

It is an arithmetic number, because the mean of its divisors is an integer number (16851873).

Almost surely, 2^56172905 is an apocalyptic number.

It is an amenable number.

56172905 is a deficient number, since it is larger than the sum of its proper divisors (11234587).

56172905 is a wasteful number, since it uses less digits than its factorization.

56172905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11234586.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 56172905 is about 7494.8585710472. The cubic root of 56172905 is about 382.9795883838.

The spelling of 56172905 in words is "fifty-six million, one hundred seventy-two thousand, nine hundred five".