31312007 has 2 divisors, whose sum is σ = 31312008. Its totient is φ = 31312006.

The previous prime is 31311997. The next prime is 31312033. The reversal of 31312007 is 70021313.

It is a weak prime.

It is an emirp because it is prime and its reverse (70021313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31312007 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 (31312037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656003 + 15656004.

It is an arithmetic number, because the mean of its divisors is an integer number (15656004).

Almost surely, 2^31312007 is an apocalyptic number.

31312007 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312007 is an equidigital number, since it uses as much as digits as its factorization.

31312007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 31312007 is about 5595.7132699952. The cubic root of 31312007 is about 315.1884552994.

The spelling of 31312007 in words is "thirty-one million, three hundred twelve thousand, seven".