39131969 has 2 divisors, whose sum is σ = 39131970. Its totient is φ = 39131968.

The previous prime is 39131959. The next prime is 39131971. The reversal of 39131969 is 96913193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22420225 + 16711744 = 4735^2 + 4088^2 .

It is a cyclic number.

It is not a de Polignac number, because 39131969 - 2⁸ = 39131713 is a prime.

It is a super-2 number, since 2×39131969² = 3062621995633922, which contains 22 as substring.

Together with 39131971, 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 (39131959) 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, 19565984 + 19565985.

It is an arithmetic number, because the mean of its divisors is an integer number (19565985).

Almost surely, 2^39131969 is an apocalyptic number.

It is an amenable number.

39131969 is a deficient number, since it is larger than the sum of its proper divisors (1).

39131969 is an equidigital number, since it uses as much as digits as its factorization.

39131969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39366, while the sum is 41.

The square root of 39131969 is about 6255.5550513124. Note that the first 3 decimals coincide. The cubic root of 39131969 is about 339.5032220256.

The spelling of 39131969 in words is "thirty-nine million, one hundred thirty-one thousand, nine hundred sixty-nine".