38311631 has 2 divisors, whose sum is σ = 38311632. Its totient is φ = 38311630.

The previous prime is 38311621. The next prime is 38311643. The reversal of 38311631 is 13611383.

It is a happy number.

38311631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (13611383) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38311631 - 2¹⁰ = 38310607 is a prime.

It is a super-2 number, since 2×38311631² = 2935562139760322, 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 38311631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38311601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19155815 + 19155816.

It is an arithmetic number, because the mean of its divisors is an integer number (19155816).

Almost surely, 2^38311631 is an apocalyptic number.

38311631 is a deficient number, since it is larger than the sum of its proper divisors (1).

38311631 is an equidigital number, since it uses as much as digits as its factorization.

38311631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 38311631 is about 6189.6390040131. The cubic root of 38311631 is about 337.1140711613.

The spelling of 38311631 in words is "thirty-eight million, three hundred eleven thousand, six hundred thirty-one".