31023132199981 has 2 divisors, whose sum is σ = 31023132199982. Its totient is φ = 31023132199980.

The previous prime is 31023132199831. The next prime is 31023132200017. The reversal of 31023132199981 is 18999123132013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28431386387881 + 2591745812100 = 5332109^2 + 1609890^2 .

It is an emirp because it is prime and its reverse (18999123132013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31023132199981 - 2¹¹ = 31023132197933 is a prime.

It is a super-2 number, since 2×31023132199981² (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 (31023132191981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15511566099990 + 15511566099991.

It is an arithmetic number, because the mean of its divisors is an integer number (15511566099991).

Almost surely, 2^{31023132199981} is an apocalyptic number.

It is an amenable number.

31023132199981 is a deficient number, since it is larger than the sum of its proper divisors (1).

31023132199981 is an equidigital number, since it uses as much as digits as its factorization.

31023132199981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 52.

The spelling of 31023132199981 in words is "thirty-one trillion, twenty-three billion, one hundred thirty-two million, one hundred ninety-nine thousand, nine hundred eighty-one".