51331236 has 96 divisors (see below), whose sum is σ = 139614720. Its totient is φ = 14515200.

The previous prime is 51331229. The next prime is 51331243. The reversal of 51331236 is 63213315.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51331229) and next prime (51331243).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243171 + ... + 243381.

It is an arithmetic number, because the mean of its divisors is an integer number (1454320).

Almost surely, 2^51331236 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 51331236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69807360).

51331236 is an abundant number, since it is smaller than the sum of its proper divisors (88283484).

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

51331236 is a wasteful number, since it uses less digits than its factorization.

51331236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 343 counting only the distinct ones).

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

The square root of 51331236 is about 7164.5820534069. The cubic root of 51331236 is about 371.6440982719.

The spelling of 51331236 in words is "fifty-one million, three hundred thirty-one thousand, two hundred thirty-six".