51996915 has 24 divisors (see below), whose sum is σ = 91147680. Its totient is φ = 27417984.

The previous prime is 51996911. The next prime is 51996937. The reversal of 51996915 is 51969915.

It is a happy number.

It is not a de Polignac number, because 51996915 - 2² = 51996911 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (51996911) 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, 2487 + ... + 10496.

It is an arithmetic number, because the mean of its divisors is an integer number (3797820).

Almost surely, 2^51996915 is an apocalyptic number.

51996915 is a deficient number, since it is larger than the sum of its proper divisors (39150765).

51996915 is a wasteful number, since it uses less digits than its factorization.

51996915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13083 (or 13080 counting only the distinct ones).

The product of its digits is 109350, while the sum is 45.

The square root of 51996915 is about 7210.8886414921. Note that the first 3 decimals coincide. The cubic root of 51996915 is about 373.2437342557.

Subtracting from 51996915 its reverse (51969915), we obtain a cube (27000 = 30³).

The spelling of 51996915 in words is "fifty-one million, nine hundred ninety-six thousand, nine hundred fifteen".