81076298121 has 135 divisors (see below), whose sum is σ = 148937654229. Its totient is φ = 42478502976.

The previous prime is 81076298059. The next prime is 81076298129. The reversal of 81076298121 is 12189267018.

The square root of 81076298121 is 284739.

It is a perfect power (a square), and thus also a powerful number.

81076298121 is a `hidden beast` number, since 8 + 1 + 0 + 7 + 629 + 8 + 12 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 43879775625 + 37196522496 = 209475^2 + 192864^2 .

It is not a de Polignac number, because 81076298121 - 2⁷ = 81076297993 is a prime.

It is a super-2 number, since 2×81076298121² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81076298129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 544136155 + ... + 544136303.

Almost surely, 2^81076298121 is an apocalyptic number.

81076298121 is the 284739-th square number.

81076298121 is the 142370-th centered octagonal number.

It is an amenable number.

81076298121 is a deficient number, since it is larger than the sum of its proper divisors (67861356108).

81076298121 is an equidigital number, since it uses as much as digits as its factorization.

81076298121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The spelling of 81076298121 in words is "eighty-one billion, seventy-six million, two hundred ninety-eight thousand, one hundred twenty-one".