51793111561 has 3 divisors (see below), whose sum is σ = 51793339143. Its totient is φ = 51792883980.

The previous prime is 51793111547. The next prime is 51793111577. The reversal of 51793111561 is 16511139715.

It is a happy number.

The square root of 51793111561 is 227581.

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., 37551075961 + 14242035600 = 193781^2 + 119340^2 .

It is not a de Polignac number, because 51793111561 - 2²³ = 51784722953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51793111511) 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, 113791 + ... + 341371.

It is an arithmetic number, because the mean of its divisors is an integer number (17264446381).

Almost surely, 2^51793111561 is an apocalyptic number.

51793111561 is the 227581-st square number.

51793111561 is the 113791-st centered octagonal number.

It is an amenable number.

51793111561 is a deficient number, since it is larger than the sum of its proper divisors (227582).

51793111561 is an frugal number, since it uses more digits than its factorization.

51793111561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455162 (or 227581 counting only the distinct ones).

The product of its digits is 28350, while the sum is 40.

The spelling of 51793111561 in words is "fifty-one billion, seven hundred ninety-three million, one hundred eleven thousand, five hundred sixty-one".