51315912 has 96 divisors (see below), whose sum is σ = 145716480. Its totient is φ = 16295040.

The previous prime is 51315871. The next prime is 51315919. The reversal of 51315912 is 21951315.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (51315919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 185118 + ... + 185394.

It is an arithmetic number, because the mean of its divisors is an integer number (1517880).

Almost surely, 2^51315912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51315912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72858240).

51315912 is an abundant number, since it is smaller than the sum of its proper divisors (94400568).

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

51315912 is a wasteful number, since it uses less digits than its factorization.

51315912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 396 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 51315912 is about 7163.5125462304. The cubic root of 51315912 is about 371.6071120791.

The spelling of 51315912 in words is "fifty-one million, three hundred fifteen thousand, nine hundred twelve".