38513831 has 2 divisors, whose sum is σ = 38513832. Its totient is φ = 38513830.

The previous prime is 38513809. The next prime is 38513833. The reversal of 38513831 is 13831583.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38513831 is a prime.

It is a super-2 number, since 2×38513831² = 2966630356593122, which contains 22 as substring.

Together with 38513833, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38513833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19256915 + 19256916.

It is an arithmetic number, because the mean of its divisors is an integer number (19256916).

Almost surely, 2^38513831 is an apocalyptic number.

38513831 is a deficient number, since it is larger than the sum of its proper divisors (1).

38513831 is an equidigital number, since it uses as much as digits as its factorization.

38513831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 38513831 is about 6205.9512566568. The cubic root of 38513831 is about 337.7061010922.

The spelling of 38513831 in words is "thirty-eight million, five hundred thirteen thousand, eight hundred thirty-one".