3121111123 has 16 divisors (see below), whose sum is σ = 3413095840. Its totient is φ = 2836871424.

The previous prime is 3121111111. The next prime is 3121111139. The reversal of 3121111123 is 3211111213.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3121111123 - 2⁹ = 3121110611 is a prime.

It is a super-2 number, since 2×3121111123² = 19482669284228642258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3121111097 and 3121111106.

It is not an unprimeable number, because it can be changed into a prime (3121111153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224215 + ... + 237727.

It is an arithmetic number, because the mean of its divisors is an integer number (213318490).

Almost surely, 2^3121111123 is an apocalyptic number.

3121111123 is a deficient number, since it is larger than the sum of its proper divisors (291984717).

3121111123 is a wasteful number, since it uses less digits than its factorization.

3121111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13798.

The product of its digits is 36, while the sum is 16.

The square root of 3121111123 is about 55866.9054360451. The cubic root of 3121111123 is about 1461.4021562798.

Adding to 3121111123 its reverse (3211111213), we get a palindrome (6332222336).

It can be divided in two parts, 3121 and 111123, that added together give a square (114244 = 338²).

The spelling of 3121111123 in words is "three billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-three".