5608721 has 2 divisors, whose sum is σ = 5608722. Its totient is φ = 5608720.

The previous prime is 5608703. The next prime is 5608723. The reversal of 5608721 is 1278065.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5125696 + 483025 = 2264^2 + 695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5608721 is a prime.

Together with 5608723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (5608723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2804360 + 2804361.

It is an arithmetic number, because the mean of its divisors is an integer number (2804361).

Almost surely, 2^5608721 is an apocalyptic number.

It is an amenable number.

5608721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5608721 is an equidigital number, since it uses as much as digits as its factorization.

5608721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 5608721 is about 2368.2738439632. The cubic root of 5608721 is about 177.6729359987.

The spelling of 5608721 in words is "five million, six hundred eight thousand, seven hundred twenty-one".