51615750481 has 3 divisors (see below), whose sum is σ = 51615977673. Its totient is φ = 51615523290.

The previous prime is 51615750469. The next prime is 51615750491. The reversal of 51615750481 is 18405751615.

The square root of 51615750481 is 227191.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18405751615 = 5 ⋅3681150323.

It is not a de Polignac number, because 51615750481 - 2³⁵ = 17256012113 is a prime.

It is a super-2 number, since 2×51615750481² (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 (51615750491) 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, 113596 + ... + 340786.

It is an arithmetic number, because the mean of its divisors is an integer number (17205325891).

Almost surely, 2^51615750481 is an apocalyptic number.

51615750481 is the 227191-st square number.

51615750481 is the 113596-th centered octagonal number.

It is an amenable number.

51615750481 is a deficient number, since it is larger than the sum of its proper divisors (227192).

51615750481 is an frugal number, since it uses more digits than its factorization.

51615750481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454382 (or 227191 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 43.

The spelling of 51615750481 in words is "fifty-one billion, six hundred fifteen million, seven hundred fifty thousand, four hundred eighty-one".