3109581 has 12 divisors (see below), whose sum is σ = 4554108. Its totient is φ = 2044224.

The previous prime is 3109553. The next prime is 3109607. The reversal of 3109581 is 1859013.

It can be written as a sum of positive squares in 2 ways, for example, as 1121481 + 1988100 = 1059^2 + 1410^2 .

It is not a de Polignac number, because 3109581 - 2⁵ = 3109549 is a prime.

It is a super-2 number, since 2×3109581² = 19338987991122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3109501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1710 + ... + 3023.

It is an arithmetic number, because the mean of its divisors is an integer number (379509).

Almost surely, 2^3109581 is an apocalyptic number.

It is an amenable number.

3109581 is a deficient number, since it is larger than the sum of its proper divisors (1444527).

3109581 is a wasteful number, since it uses less digits than its factorization.

3109581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4812 (or 4809 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 3109581 is about 1763.4004083021. The cubic root of 3109581 is about 145.9600347232.

The spelling of 3109581 in words is "three million, one hundred nine thousand, five hundred eighty-one".