312111123 has 4 divisors (see below), whose sum is σ = 416148168. Its totient is φ = 208074080.

The previous prime is 312111103. The next prime is 312111139. The reversal of 312111123 is 321111213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321111213 = 3 ⋅107037071.

It is a cyclic number.

It is not a de Polignac number, because 312111123 - 2⁸ = 312110867 is a prime.

It is a super-2 number, since 2×312111123² = 194826706200642258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (312111103) 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, 52018518 + ... + 52018523.

It is an arithmetic number, because the mean of its divisors is an integer number (104037042).

Almost surely, 2^312111123 is an apocalyptic number.

312111123 is a deficient number, since it is larger than the sum of its proper divisors (104037045).

312111123 is a wasteful number, since it uses less digits than its factorization.

312111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104037044.

The product of its digits is 36, while the sum is 15.

The square root of 312111123 is about 17666.6670031447. The cubic root of 312111123 is about 678.3228007522.

Adding to 312111123 its reverse (321111213), we get a palindrome (633222336).

The spelling of 312111123 in words is "three hundred twelve million, one hundred eleven thousand, one hundred twenty-three".