42831631 has 2 divisors, whose sum is σ = 42831632. Its totient is φ = 42831630.

The previous prime is 42831587. The next prime is 42831647. The reversal of 42831631 is 13613824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42831631 - 2²¹ = 40734479 is a prime.

It is a super-2 number, since 2×42831631² = 3669097228240322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42831631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42831661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21415815 + 21415816.

It is an arithmetic number, because the mean of its divisors is an integer number (21415816).

Almost surely, 2^42831631 is an apocalyptic number.

42831631 is a deficient number, since it is larger than the sum of its proper divisors (1).

42831631 is an equidigital number, since it uses as much as digits as its factorization.

42831631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 42831631 is about 6544.5879167446. The cubic root of 42831631 is about 349.8819493031.

The spelling of 42831631 in words is "forty-two million, eight hundred thirty-one thousand, six hundred thirty-one".