31930159 has 2 divisors, whose sum is σ = 31930160. Its totient is φ = 31930158.

The previous prime is 31930153. The next prime is 31930177. The reversal of 31930159 is 95103913.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31930159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31930159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31930153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15965079 + 15965080.

It is an arithmetic number, because the mean of its divisors is an integer number (15965080).

Almost surely, 2^31930159 is an apocalyptic number.

31930159 is a deficient number, since it is larger than the sum of its proper divisors (1).

31930159 is an equidigital number, since it uses as much as digits as its factorization.

31930159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3645, while the sum is 31.

The square root of 31930159 is about 5650.6777469610. The cubic root of 31930159 is about 317.2490719963.

The spelling of 31930159 in words is "thirty-one million, nine hundred thirty thousand, one hundred fifty-nine".