39913631 has 2 divisors, whose sum is σ = 39913632. Its totient is φ = 39913630.

The previous prime is 39913619. The next prime is 39913649. The reversal of 39913631 is 13631993.

It is a weak prime.

It is an emirp because it is prime and its reverse (13631993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39913631 - 2⁶ = 39913567 is a prime.

It is a super-2 number, since 2×39913631² = 3186195879208322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 39913591 and 39913600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39913651) 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, 19956815 + 19956816.

It is an arithmetic number, because the mean of its divisors is an integer number (19956816).

Almost surely, 2^39913631 is an apocalyptic number.

39913631 is a deficient number, since it is larger than the sum of its proper divisors (1).

39913631 is an equidigital number, since it uses as much as digits as its factorization.

39913631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 35.

The square root of 39913631 is about 6317.7235615370. The cubic root of 39913631 is about 341.7488637718.

The spelling of 39913631 in words is "thirty-nine million, nine hundred thirteen thousand, six hundred thirty-one".