51315361 has 4 divisors (see below), whose sum is σ = 51425712. Its totient is φ = 51205012.

The previous prime is 51315359. The next prime is 51315389. The reversal of 51315361 is 16351315.

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.

It is a cyclic number.

It is not a de Polignac number, because 51315361 - 2¹ = 51315359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51315301) 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, 54475 + ... + 55408.

It is an arithmetic number, because the mean of its divisors is an integer number (12856428).

Almost surely, 2^51315361 is an apocalyptic number.

It is an amenable number.

51315361 is a deficient number, since it is larger than the sum of its proper divisors (110351).

51315361 is a wasteful number, since it uses less digits than its factorization.

51315361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110350.

The product of its digits is 1350, while the sum is 25.

The square root of 51315361 is about 7163.4740873406. The cubic root of 51315361 is about 371.6057820417.

Adding to 51315361 its reverse (16351315), we get a palindrome (67666676).

The spelling of 51315361 in words is "fifty-one million, three hundred fifteen thousand, three hundred sixty-one".