3656491 has 2 divisors, whose sum is σ = 3656492. Its totient is φ = 3656490.

The previous prime is 3656483. The next prime is 3656509. The reversal of 3656491 is 1946563.

It is a weak prime.

It is an emirp because it is prime and its reverse (1946563) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3656491 - 2³ = 3656483 is a prime.

It is not a weakly prime, because it can be changed into another prime (3656441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1828245 + 1828246.

It is an arithmetic number, because the mean of its divisors is an integer number (1828246).

Almost surely, 2^3656491 is an apocalyptic number.

3656491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3656491 is an equidigital number, since it uses as much as digits as its factorization.

3656491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 3656491 is about 1912.1953352103. The cubic root of 3656491 is about 154.0593884624.

The spelling of 3656491 in words is "three million, six hundred fifty-six thousand, four hundred ninety-one".