31315007 has 2 divisors, whose sum is σ = 31315008. Its totient is φ = 31315006.

The previous prime is 31314989. The next prime is 31315013. The reversal of 31315007 is 70051313.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31315007 - 2¹² = 31310911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31315007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31315307) 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, 15657503 + 15657504.

It is an arithmetic number, because the mean of its divisors is an integer number (15657504).

Almost surely, 2^31315007 is an apocalyptic number.

31315007 is a deficient number, since it is larger than the sum of its proper divisors (1).

31315007 is an equidigital number, since it uses as much as digits as its factorization.

31315007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 315, while the sum is 20.

The square root of 31315007 is about 5595.9813259159. The cubic root of 31315007 is about 315.1985210352.

The spelling of 31315007 in words is "thirty-one million, three hundred fifteen thousand, seven".