3656261 has 4 divisors (see below), whose sum is σ = 4178592. Its totient is φ = 3133932.

The previous prime is 3656251. The next prime is 3656267. The reversal of 3656261 is 1626563.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1626563 = 577 ⋅2819.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3656261 is a prime.

It is a super-3 number, since 3×3656261³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656267) 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, 261155 + ... + 261168.

It is an arithmetic number, because the mean of its divisors is an integer number (1044648).

Almost surely, 2^3656261 is an apocalyptic number.

It is an amenable number.

3656261 is a deficient number, since it is larger than the sum of its proper divisors (522331).

3656261 is an equidigital number, since it uses as much as digits as its factorization.

3656261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522330.

The product of its digits is 6480, while the sum is 29.

The square root of 3656261 is about 1912.1351939651. The cubic root of 3656261 is about 154.0561581885.

The spelling of 3656261 in words is "three million, six hundred fifty-six thousand, two hundred sixty-one".