40631831 has 2 divisors, whose sum is σ = 40631832. Its totient is φ = 40631830.

The previous prime is 40631797. The next prime is 40631849. The reversal of 40631831 is 13813604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40631831 - 2¹⁸ = 40369687 is a prime.

It is a super-2 number, since 2×40631831² = 3301891380825122, 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 40631831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40631881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20315915 + 20315916.

It is an arithmetic number, because the mean of its divisors is an integer number (20315916).

Almost surely, 2^40631831 is an apocalyptic number.

40631831 is a deficient number, since it is larger than the sum of its proper divisors (1).

40631831 is an equidigital number, since it uses as much as digits as its factorization.

40631831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 40631831 is about 6374.3102371943. The cubic root of 40631831 is about 343.7864835767.

The spelling of 40631831 in words is "forty million, six hundred thirty-one thousand, eight hundred thirty-one".