51081876169 has 3 divisors (see below), whose sum is σ = 51082102183. Its totient is φ = 51081650156.

The previous prime is 51081876161. The next prime is 51081876193. The reversal of 51081876169 is 96167818015.

The square root of 51081876169 is 226013.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4334247225 + 46747628944 = 65835^2 + 216212^2 .

It is not a de Polignac number, because 51081876169 - 2³ = 51081876161 is a prime.

It is a super-2 number, since 2×51081876169² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51081876161) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 113007 + ... + 339019.

Almost surely, 2^51081876169 is an apocalyptic number.

51081876169 is the 226013-rd square number.

51081876169 is the 113007-th centered octagonal number.

It is an amenable number.

51081876169 is a deficient number, since it is larger than the sum of its proper divisors (226014).

51081876169 is an frugal number, since it uses more digits than its factorization.

51081876169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452026 (or 226013 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 51081876169 in words is "fifty-one billion, eighty-one million, eight hundred seventy-six thousand, one hundred sixty-nine".