31345679 has 2 divisors, whose sum is σ = 31345680. Its totient is φ = 31345678.

The previous prime is 31345669. The next prime is 31345703. The reversal of 31345679 is 97654313.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (97654313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31345679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31345609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15672839 + 15672840.

It is an arithmetic number, because the mean of its divisors is an integer number (15672840).

Almost surely, 2^31345679 is an apocalyptic number.

31345679 is a deficient number, since it is larger than the sum of its proper divisors (1).

31345679 is an equidigital number, since it uses as much as digits as its factorization.

31345679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 38.

The square root of 31345679 is about 5598.7211932726. The cubic root of 31345679 is about 315.3013962513.

The spelling of 31345679 in words is "thirty-one million, three hundred forty-five thousand, six hundred seventy-nine".