51512132 has 36 divisors (see below), whose sum is σ = 106078140. Its totient is φ = 21821184.

The previous prime is 51512129. The next prime is 51512147. The reversal of 51512132 is 23121515.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25969216 + 25542916 = 5096^2 + 5054^2 .

It is a super-4 number, since 4×51512132⁴ (a number of 32 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15968 + ... + 18920.

It is an arithmetic number, because the mean of its divisors is an integer number (2946615).

Almost surely, 2^51512132 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 51512132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53039070).

51512132 is an abundant number, since it is smaller than the sum of its proper divisors (54566008).

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

51512132 is a wasteful number, since it uses less digits than its factorization.

51512132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3060 (or 3051 counting only the distinct ones).

The product of its digits is 300, while the sum is 20.

The square root of 51512132 is about 7177.1952739214. The cubic root of 51512132 is about 372.0801557724.

Adding to 51512132 its reverse (23121515), we get a palindrome (74633647).

The spelling of 51512132 in words is "fifty-one million, five hundred twelve thousand, one hundred thirty-two".