51130761257 has 4 divisors (see below), whose sum is σ = 51850912896. Its totient is φ = 50410609620.

The previous prime is 51130761247. The next prime is 51130761289. The reversal of 51130761257 is 75216703115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75216703115 = 5 ⋅15043340623.

It is a cyclic number.

It is not a de Polignac number, because 51130761257 - 2⁶ = 51130761193 is a prime.

It is a super-2 number, since 2×51130761257² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51130761257.

It is not an unprimeable number, because it can be changed into a prime (51130761247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360075713 + ... + 360075854.

It is an arithmetic number, because the mean of its divisors is an integer number (12962728224).

Almost surely, 2^51130761257 is an apocalyptic number.

It is an amenable number.

51130761257 is a deficient number, since it is larger than the sum of its proper divisors (720151639).

51130761257 is an equidigital number, since it uses as much as digits as its factorization.

51130761257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720151638.

The product of its (nonzero) digits is 44100, while the sum is 38.

The spelling of 51130761257 in words is "fifty-one billion, one hundred thirty million, seven hundred sixty-one thousand, two hundred fifty-seven".