42631531 has 2 divisors, whose sum is σ = 42631532. Its totient is φ = 42631530.

The previous prime is 42631507. The next prime is 42631583. The reversal of 42631531 is 13513624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42631531 - 2⁵ = 42631499 is a prime.

It is a super-2 number, since 2×42631531² = 3634894870807922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42631496 and 42631505.

It is not a weakly prime, because it can be changed into another prime (42631591) 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, 21315765 + 21315766.

It is an arithmetic number, because the mean of its divisors is an integer number (21315766).

Almost surely, 2^42631531 is an apocalyptic number.

42631531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42631531 is an equidigital number, since it uses as much as digits as its factorization.

42631531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 42631531 is about 6529.2825792732. The cubic root of 42631531 is about 349.3362413281.

The spelling of 42631531 in words is "forty-two million, six hundred thirty-one thousand, five hundred thirty-one".