31312679 has 2 divisors, whose sum is σ = 31312680. Its totient is φ = 31312678.

The previous prime is 31312613. The next prime is 31312711. The reversal of 31312679 is 97621313.

It is a happy number.

It is an a-pointer prime, because the next prime (31312711) can be obtained adding 31312679 to its sum of digits (32).

It is a strong prime.

It is an emirp because it is prime and its reverse (97621313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31312679 - 2⁸ = 31312423 is a prime.

It is a Sophie Germain 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 (31312579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656339 + 15656340.

It is an arithmetic number, because the mean of its divisors is an integer number (15656340).

Almost surely, 2^31312679 is an apocalyptic number.

31312679 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312679 is an equidigital number, since it uses as much as digits as its factorization.

31312679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 32.

The square root of 31312679 is about 5595.7733156374. The cubic root of 31312679 is about 315.1907100801.

The spelling of 31312679 in words is "thirty-one million, three hundred twelve thousand, six hundred seventy-nine".