51171416521 has 9 divisors (see below), whose sum is σ = 52294200231. Its totient is φ = 50072257272.

The previous prime is 51171416501. The next prime is 51171416551. The reversal of 51171416521 is 12561417115.

The square root of 51171416521 is 226211.

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

It can be written as a sum of positive squares in only one way, i.e., 38320020025 + 12851396496 = 195755^2 + 113364^2 .

It is not a de Polignac number, because 51171416521 - 2²³ = 51163027913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51171416501) 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, 10629511 + ... + 10634323.

Almost surely, 2^51171416521 is an apocalyptic number.

51171416521 is the 226211-st square number.

51171416521 is the 113106-th centered octagonal number.

It is an amenable number.

51171416521 is a deficient number, since it is larger than the sum of its proper divisors (1122783710).

51171416521 is an frugal number, since it uses more digits than its factorization.

51171416521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9720 (or 4860 counting only the distinct ones).

The product of its digits is 8400, while the sum is 34.

The spelling of 51171416521 in words is "fifty-one billion, one hundred seventy-one million, four hundred sixteen thousand, five hundred twenty-one".