3123891 has 6 divisors (see below), whose sum is σ = 4512300. Its totient is φ = 2082588.

The previous prime is 3123881. The next prime is 3123893. The reversal of 3123891 is 1983213.

It is not a de Polignac number, because 3123891 - 2⁵ = 3123859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3123893) 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, 173541 + ... + 173558.

It is an arithmetic number, because the mean of its divisors is an integer number (752050).

Almost surely, 2^3123891 is an apocalyptic number.

3123891 is a deficient number, since it is larger than the sum of its proper divisors (1388409).

3123891 is a wasteful number, since it uses less digits than its factorization.

3123891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347105 (or 347102 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 3123891 is about 1767.4532525643. The cubic root of 3123891 is about 146.1835902742.

It can be divided in two parts, 31238 and 91, that added together give a square (31329 = 177²).

The spelling of 3123891 in words is "three million, one hundred twenty-three thousand, eight hundred ninety-one".