3606721 has 2 divisors, whose sum is σ = 3606722. Its totient is φ = 3606720.

The previous prime is 3606719. The next prime is 3606727. The reversal of 3606721 is 1276063.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3027600 + 579121 = 1740^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 3606721 - 2¹ = 3606719 is a prime.

Together with 3606719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3606727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1803360 + 1803361.

It is an arithmetic number, because the mean of its divisors is an integer number (1803361).

Almost surely, 2^3606721 is an apocalyptic number.

It is an amenable number.

3606721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3606721 is an equidigital number, since it uses as much as digits as its factorization.

3606721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 3606721 is about 1899.1369092301. The cubic root of 3606721 is about 153.3572043281.

The spelling of 3606721 in words is "three million, six hundred six thousand, seven hundred twenty-one".