51312717252 has 36 divisors (see below), whose sum is σ = 133212748396. Its totient is φ = 16641961920.

The previous prime is 51312717179. The next prime is 51312717257. The reversal of 51312717252 is 25271721315.

51312717252 is a `hidden beast` number, since 5 + 131 + 271 + 7 + 252 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20556677376 + 30756039876 = 143376^2 + 175374^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51312717257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19260199 + ... + 19262862.

Almost surely, 2^51312717252 is an apocalyptic number.

It is an amenable number.

51312717252 is an abundant number, since it is smaller than the sum of its proper divisors (81900031144).

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

51312717252 is a wasteful number, since it uses less digits than its factorization.

51312717252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38523108 (or 38523103 counting only the distinct ones).

The product of its digits is 29400, while the sum is 36.

The spelling of 51312717252 in words is "fifty-one billion, three hundred twelve million, seven hundred seventeen thousand, two hundred fifty-two".