51331230 has 48 divisors (see below), whose sum is σ = 134806464. Its totient is φ = 13550400.

The previous prime is 51331229. The next prime is 51331243. The reversal of 51331230 is 3213315.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6267 + ... + 11913.

It is an arithmetic number, because the mean of its divisors is an integer number (2808468).

Almost surely, 2^51331230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51331230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67403232).

51331230 is an abundant number, since it is smaller than the sum of its proper divisors (83475234).

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

51331230 is a wasteful number, since it uses less digits than its factorization.

51331230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5761 (or 5758 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 51331230 is about 7164.5816346804. The cubic root of 51331230 is about 371.6440837917.

Adding to 51331230 its reverse (3213315), we get a palindrome (54544545).

The spelling of 51331230 in words is "fifty-one million, three hundred thirty-one thousand, two hundred thirty".