51312132 has 18 divisors (see below), whose sum is σ = 129705758. Its totient is φ = 17104032.

The previous prime is 51312119. The next prime is 51312133. The reversal of 51312132 is 23121315.

51312132 is a `hidden beast` number, since 513 + 121 + 32 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28901376 + 22410756 = 5376^2 + 4734^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51312133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 712633 + ... + 712704.

Almost surely, 2^51312132 is an apocalyptic number.

It is an amenable number.

51312132 is an abundant number, since it is smaller than the sum of its proper divisors (78393626).

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

51312132 is a wasteful number, since it uses less digits than its factorization.

51312132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425347 (or 1425342 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 51312132 is about 7163.2487043240. The cubic root of 51312132 is about 371.5979874930.

Adding to 51312132 its reverse (23121315), we get a palindrome (74433447).

The spelling of 51312132 in words is "fifty-one million, three hundred twelve thousand, one hundred thirty-two".