3121903 has 4 divisors (see below), whose sum is σ = 3127288. Its totient is φ = 3116520.

The previous prime is 3121901. The next prime is 3121913. The reversal of 3121903 is 3091213.

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 3121903 - 2¹ = 3121901 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 (3121901) 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, 1701 + ... + 3022.

It is an arithmetic number, because the mean of its divisors is an integer number (781822).

Almost surely, 2^3121903 is an apocalyptic number.

3121903 is a deficient number, since it is larger than the sum of its proper divisors (5385).

3121903 is an equidigital number, since it uses as much as digits as its factorization.

3121903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5384.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 3121903 is about 1766.8907719494. The cubic root of 3121903 is about 146.1525739715.

The spelling of 3121903 in words is "three million, one hundred twenty-one thousand, nine hundred three".