56559981 has 8 divisors (see below), whose sum is σ = 75472000. Its totient is φ = 37677312.

The previous prime is 56559973. The next prime is 56559989. The reversal of 56559981 is 18995565.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (56559973) and next prime (56559989).

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

It is not a de Polignac number, because 56559981 - 2³ = 56559973 is a prime.

It is a super-2 number, since 2×56559981² = 6398062901440722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56559981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56559989) 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, 2356 + ... + 10893.

It is an arithmetic number, because the mean of its divisors is an integer number (9434000).

Almost surely, 2^56559981 is an apocalyptic number.

It is an amenable number.

56559981 is a deficient number, since it is larger than the sum of its proper divisors (18912019).

56559981 is a wasteful number, since it uses less digits than its factorization.

56559981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14675.

The product of its digits is 486000, while the sum is 48.

The square root of 56559981 is about 7520.6370075945. The cubic root of 56559981 is about 383.8572535290.

The spelling of 56559981 in words is "fifty-six million, five hundred fifty-nine thousand, nine hundred eighty-one".