31231320211979 has 2 divisors, whose sum is σ = 31231320211980. Its totient is φ = 31231320211978.

The previous prime is 31231320211957. The next prime is 31231320212023. The reversal of 31231320211979 is 97911202313213.

It is an a-pointer prime, because the next prime (31231320212023) can be obtained adding 31231320211979 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31231320211979 is a prime.

It is not a weakly prime, because it can be changed into another prime (31231320211919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615660105989 + 15615660105990.

It is an arithmetic number, because the mean of its divisors is an integer number (15615660105990).

Almost surely, 2^{31231320211979} is an apocalyptic number.

31231320211979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231320211979 is an equidigital number, since it uses as much as digits as its factorization.

31231320211979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 31231320211979 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred twenty million, two hundred eleven thousand, nine hundred seventy-nine".