3108921 has 4 divisors (see below), whose sum is σ = 4145232. Its totient is φ = 2072612.

The previous prime is 3108901. The next prime is 3108949. The reversal of 3108921 is 1298013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3108921 - 2⁷ = 3108793 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 3108891 and 3108900.

It is not an unprimeable number, because it can be changed into a prime (3108901) 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, 518151 + ... + 518156.

It is an arithmetic number, because the mean of its divisors is an integer number (1036308).

Almost surely, 2^3108921 is an apocalyptic number.

It is an amenable number.

3108921 is a deficient number, since it is larger than the sum of its proper divisors (1036311).

3108921 is a wasteful number, since it uses less digits than its factorization.

3108921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036310.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 3108921 is about 1763.2132599320. The cubic root of 3108921 is about 145.9497074541.

The spelling of 3108921 in words is "three million, one hundred eight thousand, nine hundred twenty-one".