31311211223309 has 2 divisors, whose sum is σ = 31311211223310. Its totient is φ = 31311211223308.

The previous prime is 31311211223273. The next prime is 31311211223333. The reversal of 31311211223309 is 90332211211313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24995650189225 + 6315561034084 = 4999565^2 + 2513078^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311211223309 - 2⁸ = 31311211223053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31311211225309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655605611654 + 15655605611655.

It is an arithmetic number, because the mean of its divisors is an integer number (15655605611655).

Almost surely, 2^{31311211223309} is an apocalyptic number.

It is an amenable number.

31311211223309 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311211223309 is an equidigital number, since it uses as much as digits as its factorization.

31311211223309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The spelling of 31311211223309 in words is "thirty-one trillion, three hundred eleven billion, two hundred eleven million, two hundred twenty-three thousand, three hundred nine".