56721159 has 12 divisors (see below), whose sum is σ = 89378952. Its totient is φ = 34376400.

The previous prime is 56721157. The next prime is 56721179. The reversal of 56721159 is 95112765.

It is not a de Polignac number, because 56721159 - 2¹ = 56721157 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56721157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286372 + ... + 286569.

It is an arithmetic number, because the mean of its divisors is an integer number (7448246).

Almost surely, 2^56721159 is an apocalyptic number.

56721159 is a deficient number, since it is larger than the sum of its proper divisors (32657793).

56721159 is a wasteful number, since it uses less digits than its factorization.

56721159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572958 (or 572955 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 56721159 is about 7531.3450989846. The cubic root of 56721159 is about 384.2215315152.

The spelling of 56721159 in words is "fifty-six million, seven hundred twenty-one thousand, one hundred fifty-nine".