12115111 has 4 divisors (see below), whose sum is σ = 12343752. Its totient is φ = 11886472.

The previous prime is 12115091. The next prime is 12115123. The reversal of 12115111 is 11151121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11151121 = 1489 ⋅7489.

It is a cyclic number.

It is not a de Polignac number, because 12115111 - 2¹⁷ = 11984039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12115091 and 12115100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12115151) 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, 114241 + ... + 114346.

It is an arithmetic number, because the mean of its divisors is an integer number (3085938).

Almost surely, 2^12115111 is an apocalyptic number.

12115111 is the 1861-st centered heptagonal number.

12115111 is a deficient number, since it is larger than the sum of its proper divisors (228641).

12115111 is an equidigital number, since it uses as much as digits as its factorization.

12115111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228640.

The product of its digits is 10, while the sum is 13.

The square root of 12115111 is about 3480.6768020027. The cubic root of 12115111 is about 229.6725712697.

Adding to 12115111 its reverse (11151121), we get a palindrome (23266232).

It can be divided in two parts, 1 and 2115111, that added together give a palindrome (2115112).

The spelling of 12115111 in words is "twelve million, one hundred fifteen thousand, one hundred eleven".