31224239969081 has 2 divisors, whose sum is σ = 31224239969082. Its totient is φ = 31224239969080.

The previous prime is 31224239969063. The next prime is 31224239969093. The reversal of 31224239969081 is 18096993242213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18907712890000 + 12316527079081 = 4348300^2 + 3509491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31224239969081 is a prime.

It is a super-2 number, since 2×31224239969081² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31224239969081.

It is not a weakly prime, because it can be changed into another prime (31224239969011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612119984540 + 15612119984541.

It is an arithmetic number, because the mean of its divisors is an integer number (15612119984541).

Almost surely, 2^{31224239969081} is an apocalyptic number.

It is an amenable number.

31224239969081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31224239969081 is an equidigital number, since it uses as much as digits as its factorization.

31224239969081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10077696, while the sum is 59.

The spelling of 31224239969081 in words is "thirty-one trillion, two hundred twenty-four billion, two hundred thirty-nine million, nine hundred sixty-nine thousand, eighty-one".