42556931 has 2 divisors, whose sum is σ = 42556932. Its totient is φ = 42556930.

The previous prime is 42556909. The next prime is 42556939. The reversal of 42556931 is 13965524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42556931 - 2¹⁰ = 42555907 is a prime.

It is a super-2 number, since 2×42556931² = 3622184752277522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42556891 and 42556900.

It is not a weakly prime, because it can be changed into another prime (42556939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21278465 + 21278466.

It is an arithmetic number, because the mean of its divisors is an integer number (21278466).

Almost surely, 2^42556931 is an apocalyptic number.

42556931 is a deficient number, since it is larger than the sum of its proper divisors (1).

42556931 is an equidigital number, since it uses as much as digits as its factorization.

42556931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 35.

The square root of 42556931 is about 6523.5673523004. The cubic root of 42556931 is about 349.1323570303.

The spelling of 42556931 in words is "forty-two million, five hundred fifty-six thousand, nine hundred thirty-one".