39131881 has 2 divisors, whose sum is σ = 39131882. Its totient is φ = 39131880.

The previous prime is 39131879. The next prime is 39131959. The reversal of 39131881 is 18813193.

It is a happy number.

39131881 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 can be written as a sum of positive squares in only one way, i.e., 23921881 + 15210000 = 4891^2 + 3900^2 .

It is a cyclic number.

It is not a de Polignac number, because 39131881 - 2¹ = 39131879 is a prime.

It is a super-2 number, since 2×39131881² = 3062608221196322, which contains 22 as substring.

Together with 39131879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (39131821) 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, 19565940 + 19565941.

It is an arithmetic number, because the mean of its divisors is an integer number (19565941).

Almost surely, 2^39131881 is an apocalyptic number.

It is an amenable number.

39131881 is a deficient number, since it is larger than the sum of its proper divisors (1).

39131881 is an equidigital number, since it uses as much as digits as its factorization.

39131881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 39131881 is about 6255.5480175601. The cubic root of 39131881 is about 339.5029675337.

The spelling of 39131881 in words is "thirty-nine million, one hundred thirty-one thousand, eight hundred eighty-one".