51291831529 has 9 divisors (see below), whose sum is σ = 52724177541. Its totient is φ = 49897412640.

The previous prime is 51291831523. The next prime is 51291831533. The reversal of 51291831529 is 92513819215.

The square root of 51291831529 is 226477.

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

It can be written as a sum of positive squares in 4 ways, for example, as 11323225 + 51280508304 = 3365^2 + 226452^2 .

It is not a de Polignac number, because 51291831529 - 2³⁵ = 16932093161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51291831523) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8376589 + ... + 8382709.

It is an arithmetic number, because the mean of its divisors is an integer number (5858241949).

Almost surely, 2^51291831529 is an apocalyptic number.

51291831529 is the 226477-th square number.

51291831529 is the 113239-th centered octagonal number.

It is an amenable number.

51291831529 is a deficient number, since it is larger than the sum of its proper divisors (1432346012).

51291831529 is an frugal number, since it uses more digits than its factorization.

51291831529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12316 (or 6158 counting only the distinct ones).

The product of its digits is 194400, while the sum is 46.

The spelling of 51291831529 in words is "fifty-one billion, two hundred ninety-one million, eight hundred thirty-one thousand, five hundred twenty-nine".