51704313251 has 4 divisors (see below), whose sum is σ = 52965394104. Its totient is φ = 50443232400.

The previous prime is 51704313233. The next prime is 51704313253. The reversal of 51704313251 is 15231340715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51704313251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51704313253) 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, 630540365 + ... + 630540446.

It is an arithmetic number, because the mean of its divisors is an integer number (13241348526).

Almost surely, 2^51704313251 is an apocalyptic number.

51704313251 is a deficient number, since it is larger than the sum of its proper divisors (1261080853).

51704313251 is a wasteful number, since it uses less digits than its factorization.

51704313251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261080852.

The product of its (nonzero) digits is 12600, while the sum is 32.

Adding to 51704313251 its reverse (15231340715), we get a palindrome (66935653966).

The spelling of 51704313251 in words is "fifty-one billion, seven hundred four million, three hundred thirteen thousand, two hundred fifty-one".