31489825121 has 2 divisors, whose sum is σ = 31489825122. Its totient is φ = 31489825120.

The previous prime is 31489825111. The next prime is 31489825153. The reversal of 31489825121 is 12152898413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23050830625 + 8438994496 = 151825^2 + 91864^2 .

It is a cyclic number.

It is not a de Polignac number, because 31489825121 - 2³⁰ = 30416083297 is a prime.

It is not a weakly prime, because it can be changed into another prime (31489825111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15744912560 + 15744912561.

It is an arithmetic number, because the mean of its divisors is an integer number (15744912561).

Almost surely, 2^31489825121 is an apocalyptic number.

It is an amenable number.

31489825121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31489825121 is an equidigital number, since it uses as much as digits as its factorization.

31489825121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 44.

The spelling of 31489825121 in words is "thirty-one billion, four hundred eighty-nine million, eight hundred twenty-five thousand, one hundred twenty-one".