38931491 has 2 divisors, whose sum is σ = 38931492. Its totient is φ = 38931490.

The previous prime is 38931467. The next prime is 38931493. The reversal of 38931491 is 19413983.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38931491 is a prime.

Together with 38931493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38931493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19465745 + 19465746.

It is an arithmetic number, because the mean of its divisors is an integer number (19465746).

Almost surely, 2^38931491 is an apocalyptic number.

38931491 is a deficient number, since it is larger than the sum of its proper divisors (1).

38931491 is an equidigital number, since it uses as much as digits as its factorization.

38931491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 38931491 is about 6239.5104775936. The cubic root of 38931491 is about 338.9224565434.

The spelling of 38931491 in words is "thirty-eight million, nine hundred thirty-one thousand, four hundred ninety-one".