5997721 has 2 divisors, whose sum is σ = 5997722. Its totient is φ = 5997720.

The previous prime is 5997713. The next prime is 5997731. The reversal of 5997721 is 1277995.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5593225 + 404496 = 2365^2 + 636^2 .

It is a cyclic number.

It is not a de Polignac number, because 5997721 - 2³ = 5997713 is a prime.

It is not a weakly prime, because it can be changed into another prime (5997731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2998860 + 2998861.

It is an arithmetic number, because the mean of its divisors is an integer number (2998861).

Almost surely, 2^5997721 is an apocalyptic number.

It is an amenable number.

5997721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5997721 is an equidigital number, since it uses as much as digits as its factorization.

5997721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 40.

The square root of 5997721 is about 2449.0244996733. The cubic root of 5997721 is about 181.6890496040.

The spelling of 5997721 in words is "five million, nine hundred ninety-seven thousand, seven hundred twenty-one".