51312351 has 4 divisors (see below), whose sum is σ = 68416472. Its totient is φ = 34208232.

The previous prime is 51312337. The next prime is 51312353. The reversal of 51312351 is 15321315.

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

It is not a de Polignac number, because 51312351 - 2¹⁰ = 51311327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51312353) 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, 8552056 + ... + 8552061.

It is an arithmetic number, because the mean of its divisors is an integer number (17104118).

Almost surely, 2^51312351 is an apocalyptic number.

51312351 is a deficient number, since it is larger than the sum of its proper divisors (17104121).

51312351 is a wasteful number, since it uses less digits than its factorization.

51312351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17104120.

The product of its digits is 450, while the sum is 21.

The square root of 51312351 is about 7163.2639906679. The cubic root of 51312351 is about 371.5985161519.

Adding to 51312351 its reverse (15321315), we get a palindrome (66633666).

The spelling of 51312351 in words is "fifty-one million, three hundred twelve thousand, three hundred fifty-one".