56000091 has 24 divisors (see below), whose sum is σ = 91970640. Its totient is φ = 30116352.

The previous prime is 56000089. The next prime is 56000093. The reversal of 56000091 is 19000065.

It is an interprime number because it is at equal distance from previous prime (56000089) and next prime (56000093).

It is not a de Polignac number, because 56000091 - 2¹ = 56000089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

56000091 is a modest number, since divided by 91 gives 56 as remainder.

It is not an unprimeable number, because it can be changed into a prime (56000093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8706 + ... + 13703.

It is an arithmetic number, because the mean of its divisors is an integer number (3832110).

Almost surely, 2^56000091 is an apocalyptic number.

56000091 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

56000091 is a deficient number, since it is larger than the sum of its proper divisors (35970549).

56000091 is a wasteful number, since it uses less digits than its factorization.

56000091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22443 (or 22436 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 56000091 is about 7483.3208537387. The cubic root of 56000091 is about 382.5864437886.

The spelling of 56000091 in words is "fifty-six million, ninety-one", and thus it is an aban number and an uban number.