31032139 has 2 divisors, whose sum is σ = 31032140. Its totient is φ = 31032138.

The previous prime is 31032097. The next prime is 31032151. The reversal of 31032139 is 93123013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31032139 - 2¹¹ = 31030091 is a prime.

It is not a weakly prime, because it can be changed into another prime (31032439) 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, 15516069 + 15516070.

It is an arithmetic number, because the mean of its divisors is an integer number (15516070).

Almost surely, 2^31032139 is an apocalyptic number.

31032139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31032139 is an equidigital number, since it uses as much as digits as its factorization.

31032139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 31032139 is about 5570.6497825658. The cubic root of 31032139 is about 314.2465877797.

The spelling of 31032139 in words is "thirty-one million, thirty-two thousand, one hundred thirty-nine".