42656331 has 4 divisors (see below), whose sum is σ = 56875112. Its totient is φ = 28437552.

The previous prime is 42656321. The next prime is 42656353. The reversal of 42656331 is 13365624.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 42656331 - 2⁶ = 42656267 is a prime.

It is a super-2 number, since 2×42656331² = 3639125148763122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42656321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7109386 + ... + 7109391.

It is an arithmetic number, because the mean of its divisors is an integer number (14218778).

Almost surely, 2^42656331 is an apocalyptic number.

42656331 is a deficient number, since it is larger than the sum of its proper divisors (14218781).

42656331 is a wasteful number, since it uses less digits than its factorization.

42656331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14218780.

The product of its digits is 12960, while the sum is 30.

The square root of 42656331 is about 6531.1814398315. The cubic root of 42656331 is about 349.4039678768.

The spelling of 42656331 in words is "forty-two million, six hundred fifty-six thousand, three hundred thirty-one".