51311730 has 32 divisors (see below), whose sum is σ = 127396800. Its totient is φ = 13211072.

The previous prime is 51311719. The next prime is 51311747. The reversal of 51311730 is 3711315.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51311697 and 51311706.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28620 + ... + 30359.

It is an arithmetic number, because the mean of its divisors is an integer number (3981150).

Almost surely, 2^51311730 is an apocalyptic number.

51311730 is an abundant number, since it is smaller than the sum of its proper divisors (76085070).

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

51311730 is a wasteful number, since it uses less digits than its factorization.

51311730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59018.

The product of its (nonzero) digits is 315, while the sum is 21.

The square root of 51311730 is about 7163.2206443750. The cubic root of 51311730 is about 371.5970170741.

The spelling of 51311730 in words is "fifty-one million, three hundred eleven thousand, seven hundred thirty".