3656641 has 2 divisors, whose sum is σ = 3656642. Its totient is φ = 3656640.

The previous prime is 3656633. The next prime is 3656651. The reversal of 3656641 is 1466563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3010225 + 646416 = 1735^2 + 804^2 .

It is a cyclic number.

It is not a de Polignac number, because 3656641 - 2³ = 3656633 is a prime.

It is not a weakly prime, because it can be changed into another prime (3656621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1828320 + 1828321.

It is an arithmetic number, because the mean of its divisors is an integer number (1828321).

Almost surely, 2^3656641 is an apocalyptic number.

It is an amenable number.

3656641 is a deficient number, since it is larger than the sum of its proper divisors (1).

3656641 is an equidigital number, since it uses as much as digits as its factorization.

3656641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 3656641 is about 1912.2345567425. The cubic root of 3656641 is about 154.0614950898.

The spelling of 3656641 in words is "three million, six hundred fifty-six thousand, six hundred forty-one".