3121871 has 4 divisors (see below), whose sum is σ = 3286200. Its totient is φ = 2957544.

The previous prime is 3121841. The next prime is 3121873. The reversal of 3121871 is 1781213.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121873) 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, 82136 + ... + 82173.

It is an arithmetic number, because the mean of its divisors is an integer number (821550).

Almost surely, 2^3121871 is an apocalyptic number.

3121871 is a deficient number, since it is larger than the sum of its proper divisors (164329).

3121871 is a wasteful number, since it uses less digits than its factorization.

3121871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164328.

The product of its digits is 336, while the sum is 23.

The square root of 3121871 is about 1766.8817164711. The cubic root of 3121871 is about 146.1520746074.

The spelling of 3121871 in words is "three million, one hundred twenty-one thousand, eight hundred seventy-one".