3909161 has 4 divisors (see below), whose sum is σ = 4014852. Its totient is φ = 3803472.

The previous prime is 3909127. The next prime is 3909179. The reversal of 3909161 is 1619093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1619093 = 7 ⋅231299.

It can be written as a sum of positive squares in 2 ways, for example, as 1525225 + 2383936 = 1235^2 + 1544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3909161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3909361) 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, 52790 + ... + 52863.

It is an arithmetic number, because the mean of its divisors is an integer number (1003713).

Almost surely, 2^3909161 is an apocalyptic number.

It is an amenable number.

3909161 is a deficient number, since it is larger than the sum of its proper divisors (105691).

3909161 is a wasteful number, since it uses less digits than its factorization.

3909161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105690.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 3909161 is about 1977.1598316778. The cubic root of 3909161 is about 157.5292429115.

The spelling of 3909161 in words is "three million, nine hundred nine thousand, one hundred sixty-one".