5751721917 has 12 divisors (see below), whose sum is σ = 8309722044. Its totient is φ = 3833706240.

The previous prime is 5751721909. The next prime is 5751721939. The reversal of 5751721917 is 7191271575.

5751721917 is a `hidden beast` number, since 575 + 1 + 72 + 1 + 9 + 1 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4720926681 + 1030795236 = 68709^2 + 32106^2 .

It is not a de Polignac number, because 5751721917 - 2³ = 5751721909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5751721117) 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, 15634 + ... + 108387.

It is an arithmetic number, because the mean of its divisors is an integer number (692476837).

Almost surely, 2^5751721917 is an apocalyptic number.

It is an amenable number.

5751721917 is a deficient number, since it is larger than the sum of its proper divisors (2558000127).

5751721917 is a wasteful number, since it uses less digits than its factorization.

5751721917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129180 (or 129177 counting only the distinct ones).

The product of its digits is 154350, while the sum is 45.

The square root of 5751721917 is about 75840.1075750819. The cubic root of 5751721917 is about 1791.7027498638.

The spelling of 5751721917 in words is "five billion, seven hundred fifty-one million, seven hundred twenty-one thousand, nine hundred seventeen".