56859981 has 8 divisors (see below), whose sum is σ = 78427680. Its totient is φ = 36599472.

The previous prime is 56859977. The next prime is 56860003. The reversal of 56859981 is 18995865.

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

It is not a de Polignac number, because 56859981 - 2² = 56859977 is a prime.

It is a super-2 number, since 2×56859981² = 6466114878640722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56859911) 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, 326695 + ... + 326868.

It is an arithmetic number, because the mean of its divisors is an integer number (9803460).

Almost surely, 2^56859981 is an apocalyptic number.

It is an amenable number.

56859981 is a deficient number, since it is larger than the sum of its proper divisors (21567699).

56859981 is a wasteful number, since it uses less digits than its factorization.

56859981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653595.

The product of its digits is 777600, while the sum is 51.

The square root of 56859981 is about 7540.5557487496. Note that the first 3 decimals coincide. The cubic root of 56859981 is about 384.5347300180.

The spelling of 56859981 in words is "fifty-six million, eight hundred fifty-nine thousand, nine hundred eighty-one".