2815312121 has 4 divisors (see below), whose sum is σ = 2817105744. Its totient is φ = 2813518500.

The previous prime is 2815312117. The next prime is 2815312139. The reversal of 2815312121 is 1212135182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2815312121 - 2² = 2815312117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2815312111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894455 + ... + 897596.

It is an arithmetic number, because the mean of its divisors is an integer number (704276436).

Almost surely, 2^2815312121 is an apocalyptic number.

It is an amenable number.

2815312121 is a deficient number, since it is larger than the sum of its proper divisors (1793623).

2815312121 is a wasteful number, since it uses less digits than its factorization.

2815312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793622.

The product of its digits is 960, while the sum is 26.

The square root of 2815312121 is about 53059.5148960109. The cubic root of 2815312121 is about 1412.0243412210.

The spelling of 2815312121 in words is "two billion, eight hundred fifteen million, three hundred twelve thousand, one hundred twenty-one".