5723709721 has 2 divisors, whose sum is σ = 5723709722. Its totient is φ = 5723709720.

The previous prime is 5723709713. The next prime is 5723709731. The reversal of 5723709721 is 1279073275.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4987184400 + 736525321 = 70620^2 + 27139^2 .

It is a cyclic number.

It is not a de Polignac number, because 5723709721 - 2³ = 5723709713 is a prime.

It is not a weakly prime, because it can be changed into another prime (5723709731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2861854860 + 2861854861.

It is an arithmetic number, because the mean of its divisors is an integer number (2861854861).

Almost surely, 2^5723709721 is an apocalyptic number.

It is an amenable number.

5723709721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5723709721 is an equidigital number, since it uses as much as digits as its factorization.

5723709721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 5723709721 is about 75655.2028680117. The cubic root of 5723709721 is about 1788.7893482398.

The spelling of 5723709721 in words is "five billion, seven hundred twenty-three million, seven hundred nine thousand, seven hundred twenty-one".