811331625122 has 6 divisors (see below), whose sum is σ = 1216999348443. Its totient is φ = 405665175642.

The previous prime is 811331625113. The next prime is 811331625149. The reversal of 811331625122 is 221526133118.

It can be written as a sum of positive squares in only one way, i.e., 405665812561 + 405665812561 = 636919^2 + 636919^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=636919.

It is a Duffinian number.

It is an unprimeable number.

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 in 2 ways as a sum of consecutive naturals, for example, 955379 + ... + 1592297.

Almost surely, 2^811331625122 is an apocalyptic number.

811331625122 is a deficient number, since it is larger than the sum of its proper divisors (405667723321).

811331625122 is an frugal number, since it uses more digits than its factorization.

811331625122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273840 (or 636921 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The spelling of 811331625122 in words is "eight hundred eleven billion, three hundred thirty-one million, six hundred twenty-five thousand, one hundred twenty-two".