3109891 has 8 divisors (see below), whose sum is σ = 3221568. Its totient is φ = 3000000.

The previous prime is 3109867. The next prime is 3109913. The reversal of 3109891 is 1989013.

3109891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(3109891) divides (3109891-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 3109891 - 2⁵ = 3109859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3109801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3766 + ... + 4516.

It is an arithmetic number, because the mean of its divisors is an integer number (402696).

Almost surely, 2^3109891 is an apocalyptic number.

3109891 is a deficient number, since it is larger than the sum of its proper divisors (111677).

3109891 is a wasteful number, since it uses less digits than its factorization.

3109891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 3109891 is about 1763.4883044693. The cubic root of 3109891 is about 145.9648849058.

It can be divided in two parts, 310 and 9891, that added together give a palindrome (10201).

The spelling of 3109891 in words is "three million, one hundred nine thousand, eight hundred ninety-one".