56991985 has 8 divisors (see below), whose sum is σ = 69981120. Its totient is φ = 44533104.

The previous prime is 56991983. The next prime is 56991997. The reversal of 56991985 is 58919965.

56991985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 56991985 - 2¹ = 56991983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56991983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132325 + ... + 132754.

It is an arithmetic number, because the mean of its divisors is an integer number (8747640).

Almost surely, 2^56991985 is an apocalyptic number.

It is an amenable number.

56991985 is a deficient number, since it is larger than the sum of its proper divisors (12989135).

56991985 is a wasteful number, since it uses less digits than its factorization.

56991985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265127.

The product of its digits is 874800, while the sum is 52.

The square root of 56991985 is about 7549.3036102676. The cubic root of 56991985 is about 384.8320738397.

The spelling of 56991985 in words is "fifty-six million, nine hundred ninety-one thousand, nine hundred eighty-five".