51132312 has 192 divisors, whose sum is σ = 180610560. Its totient is φ = 12672000.

The previous prime is 51132293. The next prime is 51132317. The reversal of 51132312 is 21323115.

It is a super-2 number, since 2×51132312² = 5229026660930688, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51132317) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 127312 + ... + 127712.

It is an arithmetic number, because the mean of its divisors is an integer number (940680).

Almost surely, 2^51132312 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 51132312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90305280).

51132312 is an abundant number, since it is smaller than the sum of its proper divisors (129478248).

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

51132312 is a wasteful number, since it uses less digits than its factorization.

51132312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 447 counting only the distinct ones).

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

The square root of 51132312 is about 7150.6861209257. The cubic root of 51132312 is about 371.1633991793.

Adding to 51132312 its reverse (21323115), we get a palindrome (72455427).

It can be divided in two parts, 511 and 32312, that added together give a palindrome (32823).

The spelling of 51132312 in words is "fifty-one million, one hundred thirty-two thousand, three hundred twelve".