42556891 has 16 divisors (see below), whose sum is σ = 47779200. Its totient is φ = 37634688.

The previous prime is 42556889. The next prime is 42556909. The reversal of 42556891 is 19865524.

It is not a de Polignac number, because 42556891 - 2¹ = 42556889 is a prime.

It is a super-2 number, since 2×42556891² = 3622177943171762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42556841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58830 + ... + 59548.

It is an arithmetic number, because the mean of its divisors is an integer number (2986200).

Almost surely, 2^42556891 is an apocalyptic number.

42556891 is a deficient number, since it is larger than the sum of its proper divisors (5222309).

42556891 is a wasteful number, since it uses less digits than its factorization.

42556891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918.

The product of its digits is 86400, while the sum is 40.

The square root of 42556891 is about 6523.5642864925. The cubic root of 42556891 is about 349.1322476450.

The spelling of 42556891 in words is "forty-two million, five hundred fifty-six thousand, eight hundred ninety-one".