31321310111309 has 2 divisors, whose sum is σ = 31321310111310. Its totient is φ = 31321310111308.

The previous prime is 31321310111297. The next prime is 31321310111369. The reversal of 31321310111309 is 90311101312313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18084155987209 + 13237154124100 = 4252547^2 + 3638290^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321310111309 - 2²⁰ = 31321309062733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31321310111369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660655055654 + 15660655055655.

It is an arithmetic number, because the mean of its divisors is an integer number (15660655055655).

Almost surely, 2^{31321310111309} is an apocalyptic number.

It is an amenable number.

31321310111309 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321310111309 is an equidigital number, since it uses as much as digits as its factorization.

31321310111309 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 29.

The spelling of 31321310111309 in words is "thirty-one trillion, three hundred twenty-one billion, three hundred ten million, one hundred eleven thousand, three hundred nine".