31231302113981 has 2 divisors, whose sum is σ = 31231302113982. Its totient is φ = 31231302113980.

The previous prime is 31231302113927. The next prime is 31231302114059. The reversal of 31231302113981 is 18931120313213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23507855280100 + 7723446833881 = 4848490^2 + 2779109^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231302113981 - 2⁶ = 31231302113917 is a prime.

It is a super-2 number, since 2×31231302113981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31231302133981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615651056990 + 15615651056991.

It is an arithmetic number, because the mean of its divisors is an integer number (15615651056991).

Almost surely, 2^{31231302113981} is an apocalyptic number.

It is an amenable number.

31231302113981 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231302113981 is an equidigital number, since it uses as much as digits as its factorization.

31231302113981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 31231302113981 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred two million, one hundred thirteen thousand, nine hundred eighty-one".