3656161 has 4 divisors (see below), whose sum is σ = 3741232. Its totient is φ = 3571092.

The previous prime is 3656141. The next prime is 3656179. The reversal of 3656161 is 1616563.

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: 1616563 = 13 ⋅124351.

It is a cyclic number.

It is not a de Polignac number, because 3656161 - 2⁵ = 3656129 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3656101) 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, 42471 + ... + 42556.

It is an arithmetic number, because the mean of its divisors is an integer number (935308).

Almost surely, 2^3656161 is an apocalyptic number.

It is an amenable number.

3656161 is a deficient number, since it is larger than the sum of its proper divisors (85071).

3656161 is an equidigital number, since it uses as much as digits as its factorization.

3656161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85070.

The product of its digits is 3240, while the sum is 28.

The square root of 3656161 is about 1912.1090450076. The cubic root of 3656161 is about 154.0547536793.

The spelling of 3656161 in words is "three million, six hundred fifty-six thousand, one hundred sixty-one".