3116921 has 4 divisors (see below), whose sum is σ = 3136932. Its totient is φ = 3096912.

The previous prime is 3116873. The next prime is 3116947. The reversal of 3116921 is 1296113.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 698896 + 2418025 = 836^2 + 1555^2 .

It is a cyclic number.

It is not a de Polignac number, because 3116921 - 2⁶ = 3116857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3116951) 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, 9770 + ... + 10083.

It is an arithmetic number, because the mean of its divisors is an integer number (784233).

Almost surely, 2^3116921 is an apocalyptic number.

It is an amenable number.

3116921 is a deficient number, since it is larger than the sum of its proper divisors (20011).

3116921 is a wasteful number, since it uses less digits than its factorization.

3116921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20010.

The product of its digits is 324, while the sum is 23.

The square root of 3116921 is about 1765.4803878831. The cubic root of 3116921 is about 146.0747881049.

The spelling of 3116921 in words is "three million, one hundred sixteen thousand, nine hundred twenty-one".