3123121403 has 4 divisors (see below), whose sum is σ = 3123239088. Its totient is φ = 3123003720.

The previous prime is 3123121349. The next prime is 3123121439. The reversal of 3123121403 is 3041213213.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3123121403 - 2⁸ = 3123121147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3123121483) 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, 1793 + ... + 79053.

It is an arithmetic number, because the mean of its divisors is an integer number (780809772).

Almost surely, 2^3123121403 is an apocalyptic number.

3123121403 is a deficient number, since it is larger than the sum of its proper divisors (117685).

3123121403 is an equidigital number, since it uses as much as digits as its factorization.

3123121403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117684.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 3123121403 is about 55884.8942291206. The cubic root of 3123121403 is about 1461.7158476645.

Adding to 3123121403 its reverse (3041213213), we get a palindrome (6164334616).

The spelling of 3123121403 in words is "three billion, one hundred twenty-three million, one hundred twenty-one thousand, four hundred three".