40981631 has 2 divisors, whose sum is σ = 40981632. Its totient is φ = 40981630.

The previous prime is 40981621. The next prime is 40981657. The reversal of 40981631 is 13618904.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40981631 is a prime.

It is a super-2 number, since 2×40981631² = 3358988158840322, which contains 22 as substring.

It is equal to p_2489702 and since 40981631 and 2489702 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40981601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20490815 + 20490816.

It is an arithmetic number, because the mean of its divisors is an integer number (20490816).

Almost surely, 2^40981631 is an apocalyptic number.

40981631 is a deficient number, since it is larger than the sum of its proper divisors (1).

40981631 is an equidigital number, since it uses as much as digits as its factorization.

40981631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 40981631 is about 6401.6896988217. The cubic root of 40981631 is about 344.7702201650.

The spelling of 40981631 in words is "forty million, nine hundred eighty-one thousand, six hundred thirty-one".