3155661 has 6 divisors (see below), whose sum is σ = 4558190. Its totient is φ = 2103768.

The previous prime is 3155651. The next prime is 3155687. The reversal of 3155661 is 1665513.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2499561 + 656100 = 1581^2 + 810^2 .

It is not a de Polignac number, because 3155661 - 2⁵ = 3155629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3155651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 175306 + ... + 175323.

Almost surely, 2^3155661 is an apocalyptic number.

It is an amenable number.

3155661 is a deficient number, since it is larger than the sum of its proper divisors (1402529).

3155661 is a wasteful number, since it uses less digits than its factorization.

3155661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350635 (or 350632 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 3155661 is about 1776.4180251281. The cubic root of 3155661 is about 146.6774825587.

The spelling of 3155661 in words is "three million, one hundred fifty-five thousand, six hundred sixty-one".