51312918 has 16 divisors (see below), whose sum is σ = 103316400. Its totient is φ = 16989216.

The previous prime is 51312913. The next prime is 51312929. The reversal of 51312918 is 81921315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51312913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27805 + ... + 29592.

It is an arithmetic number, because the mean of its divisors is an integer number (6457275).

Almost surely, 2^51312918 is an apocalyptic number.

51312918 is an abundant number, since it is smaller than the sum of its proper divisors (52003482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51312918 is a wasteful number, since it uses less digits than its factorization.

51312918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57551.

The product of its digits is 2160, while the sum is 30.

The square root of 51312918 is about 7163.3035674890. The cubic root of 51312918 is about 371.5998848645.

It can be divided in two parts, 513 and 12918, that added together give a palindrome (13431).

The spelling of 51312918 in words is "fifty-one million, three hundred twelve thousand, nine hundred eighteen".