51361332 has 48 divisors (see below), whose sum is σ = 137625600. Its totient is φ = 14744160.

The previous prime is 51361309. The next prime is 51361333. The reversal of 51361332 is 23316315.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51361333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7732 + ... + 12747.

It is an arithmetic number, because the mean of its divisors is an integer number (2867200).

Almost surely, 2^51361332 is an apocalyptic number.

It is an amenable number.

51361332 is an abundant number, since it is smaller than the sum of its proper divisors (86264268).

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

51361332 is a wasteful number, since it uses less digits than its factorization.

51361332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20516 (or 20514 counting only the distinct ones).

The product of its digits is 1620, while the sum is 24.

The square root of 51361332 is about 7166.6820775028. The cubic root of 51361332 is about 371.7167169242.

Adding to 51361332 its reverse (23316315), we get a palindrome (74677647).

The spelling of 51361332 in words is "fifty-one million, three hundred sixty-one thousand, three hundred thirty-two".