51231030 has 96 divisors (see below), whose sum is σ = 137928960. Its totient is φ = 12142080.

The previous prime is 51231007. The next prime is 51231073. The reversal of 51231030 is 3013215.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 164575 + ... + 164885.

It is an arithmetic number, because the mean of its divisors is an integer number (1436760).

Almost surely, 2^51231030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51231030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68964480).

51231030 is an abundant number, since it is smaller than the sum of its proper divisors (86697930).

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

51231030 is a wasteful number, since it uses less digits than its factorization.

51231030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 51231030 is about 7157.5854867406. The cubic root of 51231030 is about 371.4021063843.

Adding to 51231030 its reverse (3013215), we get a palindrome (54244245).

The spelling of 51231030 in words is "fifty-one million, two hundred thirty-one thousand, thirty".