31339937 has 2 divisors, whose sum is σ = 31339938. Its totient is φ = 31339936.

The previous prime is 31339933. The next prime is 31339939. The reversal of 31339937 is 73993313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31259281 + 80656 = 5591^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 31339937 - 2² = 31339933 is a prime.

Together with 31339939, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31339937.

It is not a weakly prime, because it can be changed into another prime (31339933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15669968 + 15669969.

It is an arithmetic number, because the mean of its divisors is an integer number (15669969).

Almost surely, 2^31339937 is an apocalyptic number.

It is an amenable number.

31339937 is a deficient number, since it is larger than the sum of its proper divisors (1).

31339937 is an equidigital number, since it uses as much as digits as its factorization.

31339937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45927, while the sum is 38.

The square root of 31339937 is about 5598.2083741140. The cubic root of 31339937 is about 315.2821424420.

The spelling of 31339937 in words is "thirty-one million, three hundred thirty-nine thousand, nine hundred thirty-seven".