31012313309 has 2 divisors, whose sum is σ = 31012313310. Its totient is φ = 31012313308.

The previous prime is 31012313303. The next prime is 31012313317. The reversal of 31012313309 is 90331321013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30164047684 + 848265625 = 173678^2 + 29125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31012313309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31012313303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506156654 + 15506156655.

It is an arithmetic number, because the mean of its divisors is an integer number (15506156655).

Almost surely, 2^31012313309 is an apocalyptic number.

It is an amenable number.

31012313309 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012313309 is an equidigital number, since it uses as much as digits as its factorization.

31012313309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 26.

The spelling of 31012313309 in words is "thirty-one billion, twelve million, three hundred thirteen thousand, three hundred nine".