31132939 has 2 divisors, whose sum is σ = 31132940. Its totient is φ = 31132938.

The previous prime is 31132891. The next prime is 31132951. The reversal of 31132939 is 93923113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31132939 - 2¹⁵ = 31100171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31132939.

It is not a weakly prime, because it can be changed into another prime (31132999) 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, 15566469 + 15566470.

It is an arithmetic number, because the mean of its divisors is an integer number (15566470).

Almost surely, 2^31132939 is an apocalyptic number.

31132939 is a deficient number, since it is larger than the sum of its proper divisors (1).

31132939 is an equidigital number, since it uses as much as digits as its factorization.

31132939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 31.

The square root of 31132939 is about 5579.6898659334. The cubic root of 31132939 is about 314.5864700397.

The spelling of 31132939 in words is "thirty-one million, one hundred thirty-two thousand, nine hundred thirty-nine".