31930439 has 2 divisors, whose sum is σ = 31930440. Its totient is φ = 31930438.

The previous prime is 31930411. The next prime is 31930447. The reversal of 31930439 is 93403913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31930439 - 2²⁰ = 30881863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31930139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15965219 + 15965220.

It is an arithmetic number, because the mean of its divisors is an integer number (15965220).

Almost surely, 2^31930439 is an apocalyptic number.

31930439 is a deficient number, since it is larger than the sum of its proper divisors (1).

31930439 is an equidigital number, since it uses as much as digits as its factorization.

31930439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 31930439 is about 5650.7025226957. The cubic root of 31930439 is about 317.2499993273.

The spelling of 31930439 in words is "thirty-one million, nine hundred thirty thousand, four hundred thirty-nine".