3121943 has 4 divisors (see below), whose sum is σ = 3405768. Its totient is φ = 2838120.

The previous prime is 3121933. The next prime is 3121961. The reversal of 3121943 is 3491213.

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

It is a cyclic number.

It is not a de Polignac number, because 3121943 - 2⁴ = 3121927 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 (3121913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141896 + ... + 141917.

It is an arithmetic number, because the mean of its divisors is an integer number (851442).

Almost surely, 2^3121943 is an apocalyptic number.

3121943 is a deficient number, since it is larger than the sum of its proper divisors (283825).

3121943 is a wasteful number, since it uses less digits than its factorization.

3121943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283824.

The product of its digits is 648, while the sum is 23.

The square root of 3121943 is about 1766.9020912320. The cubic root of 3121943 is about 146.1531981717.

The spelling of 3121943 in words is "three million, one hundred twenty-one thousand, nine hundred forty-three".