31013203309709 has 2 divisors, whose sum is σ = 31013203309710. Its totient is φ = 31013203309708.

The previous prime is 31013203309703. The next prime is 31013203309721. The reversal of 31013203309709 is 90790330231013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29382665854084 + 1630537455625 = 5420578^2 + 1276925^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013203309709 - 2⁴⁰ = 29913691681933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31013203309703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506601654854 + 15506601654855.

It is an arithmetic number, because the mean of its divisors is an integer number (15506601654855).

Almost surely, 2^{31013203309709} is an apocalyptic number.

It is an amenable number.

31013203309709 is a deficient number, since it is larger than the sum of its proper divisors (1).

31013203309709 is an equidigital number, since it uses as much as digits as its factorization.

31013203309709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 41.

The spelling of 31013203309709 in words is "thirty-one trillion, thirteen billion, two hundred three million, three hundred nine thousand, seven hundred nine".