3616721 has 2 divisors, whose sum is σ = 3616722. Its totient is φ = 3616720.

The previous prime is 3616703. The next prime is 3616741. The reversal of 3616721 is 1276163.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3568321 + 48400 = 1889^2 + 220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3616721 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (3616741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1808360 + 1808361.

It is an arithmetic number, because the mean of its divisors is an integer number (1808361).

Almost surely, 2^3616721 is an apocalyptic number.

It is an amenable number.

3616721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3616721 is an equidigital number, since it uses as much as digits as its factorization.

3616721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 26.

The square root of 3616721 is about 1901.7678617539. The cubic root of 3616721 is about 153.4988063441.

The spelling of 3616721 in words is "three million, six hundred sixteen thousand, seven hundred twenty-one".