51312630 has 32 divisors (see below), whose sum is σ = 130395744. Its totient is φ = 12878336.

The previous prime is 51312617. The next prime is 51312637. The reversal of 51312630 is 3621315.

It is a junction number, because it is equal to n+sod(n) for n = 51312597 and 51312606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51312637) 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, 49797 + ... + 50816.

It is an arithmetic number, because the mean of its divisors is an integer number (4074867).

Almost surely, 2^51312630 is an apocalyptic number.

51312630 is an abundant number, since it is smaller than the sum of its proper divisors (79083114).

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

51312630 is a wasteful number, since it uses less digits than its factorization.

51312630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100640.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 51312630 is about 7163.2834650040. The cubic root of 51312630 is about 371.5991896466.

Adding to 51312630 its reverse (3621315), we get a palindrome (54933945).

The spelling of 51312630 in words is "fifty-one million, three hundred twelve thousand, six hundred thirty".