51751245121 has 3 divisors (see below), whose sum is σ = 51751472611. Its totient is φ = 51751017632.

The previous prime is 51751245103. The next prime is 51751245149. The reversal of 51751245121 is 12154215715.

The square root of 51751245121 is 227489.

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., 21753005121 + 29998240000 = 147489^2 + 173200^2 .

It is not a de Polignac number, because 51751245121 - 2²³ = 51742856513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51751245101) 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, 113745 + ... + 341233.

Almost surely, 2^51751245121 is an apocalyptic number.

51751245121 is the 227489-th square number.

51751245121 is the 113745-th centered octagonal number.

It is an amenable number.

51751245121 is a deficient number, since it is larger than the sum of its proper divisors (227490).

51751245121 is an frugal number, since it uses more digits than its factorization.

51751245121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454978 (or 227489 counting only the distinct ones).

The product of its digits is 14000, while the sum is 34.

The spelling of 51751245121 in words is "fifty-one billion, seven hundred fifty-one million, two hundred forty-five thousand, one hundred twenty-one".