5751323721 has 36 divisors (see below), whose sum is σ = 9833784324. Its totient is φ = 3217515840.

The previous prime is 5751323687. The next prime is 5751323759. The reversal of 5751323721 is 1273231575.

It is a happy number.

5751323721 is a `hidden beast` number, since 57 + 513 + 23 + 72 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3795915321 + 1955408400 = 61611^2 + 44220^2 .

It is not a de Polignac number, because 5751323721 - 2⁶ = 5751323657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5751323791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 188970 + ... + 217283.

Almost surely, 2^5751323721 is an apocalyptic number.

It is an amenable number.

5751323721 is a deficient number, since it is larger than the sum of its proper divisors (4082460603).

5751323721 is a wasteful number, since it uses less digits than its factorization.

5751323721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406294 (or 406280 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 5751323721 is about 75837.4822960256. The cubic root of 5751323721 is about 1791.6614019368.

The spelling of 5751323721 in words is "five billion, seven hundred fifty-one million, three hundred twenty-three thousand, seven hundred twenty-one".