3656291 has 4 divisors (see below), whose sum is σ = 3782400. Its totient is φ = 3530184.

The previous prime is 3656281. The next prime is 3656321. The reversal of 3656291 is 1926563.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1926563 = 61 ⋅31583.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3656291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3656231) 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 in 3 ways as a sum of consecutive naturals, for example, 63011 + ... + 63068.

It is an arithmetic number, because the mean of its divisors is an integer number (945600).

Almost surely, 2^3656291 is an apocalyptic number.

3656291 is a deficient number, since it is larger than the sum of its proper divisors (126109).

3656291 is a wasteful number, since it uses less digits than its factorization.

3656291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126108.

The product of its digits is 9720, while the sum is 32.

The square root of 3656291 is about 1912.1430385826. The cubic root of 3656291 is about 154.0565795362.

The spelling of 3656291 in words is "three million, six hundred fifty-six thousand, two hundred ninety-one".