3655591 has 4 divisors (see below), whose sum is σ = 3662712. Its totient is φ = 3648472.

The previous prime is 3655579. The next prime is 3655609. The reversal of 3655591 is 1955563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1955563 = 83 ⋅23561.

It is a cyclic number.

It is not a de Polignac number, because 3655591 - 2⁹ = 3655079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3655501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2725 + ... + 3838.

It is an arithmetic number, because the mean of its divisors is an integer number (915678).

Almost surely, 2^3655591 is an apocalyptic number.

3655591 is a deficient number, since it is larger than the sum of its proper divisors (7121).

3655591 is an equidigital number, since it uses as much as digits as its factorization.

3655591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7120.

The product of its digits is 20250, while the sum is 34.

The square root of 3655591 is about 1911.9599891211. The cubic root of 3655591 is about 154.0467474880.

The spelling of 3655591 in words is "three million, six hundred fifty-five thousand, five hundred ninety-one".