42906931 has 2 divisors, whose sum is σ = 42906932. Its totient is φ = 42906930.

The previous prime is 42906923. The next prime is 42906947. The reversal of 42906931 is 13960924.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42906931 - 2³ = 42906923 is a prime.

It is a super-2 number, since 2×42906931² = 3682009455677522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42906971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21453465 + 21453466.

It is an arithmetic number, because the mean of its divisors is an integer number (21453466).

Almost surely, 2^42906931 is an apocalyptic number.

42906931 is a deficient number, since it is larger than the sum of its proper divisors (1).

42906931 is an equidigital number, since it uses as much as digits as its factorization.

42906931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 42906931 is about 6550.3382355417. The cubic root of 42906931 is about 350.0868655141.

The spelling of 42906931 in words is "forty-two million, nine hundred six thousand, nine hundred thirty-one".