39129931 has 2 divisors, whose sum is σ = 39129932. Its totient is φ = 39129930.

The previous prime is 39129919. The next prime is 39129941. The reversal of 39129931 is 13992193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39129931 - 2¹³ = 39121739 is a prime.

It is a super-2 number, since 2×39129931² = 3062303000129522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39129941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19564965 + 19564966.

It is an arithmetic number, because the mean of its divisors is an integer number (19564966).

Almost surely, 2^39129931 is an apocalyptic number.

39129931 is a deficient number, since it is larger than the sum of its proper divisors (1).

39129931 is an equidigital number, since it uses as much as digits as its factorization.

39129931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122, while the sum is 37.

The square root of 39129931 is about 6255.3921539740. The cubic root of 39129931 is about 339.4973281269.

The spelling of 39129931 in words is "thirty-nine million, one hundred twenty-nine thousand, nine hundred thirty-one".