12113991 has 12 divisors (see below), whose sum is σ = 17528368. Its totient is φ = 8061984.

The previous prime is 12113957. The next prime is 12113993. The reversal of 12113991 is 19931121.

12113991 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12113991 - 2⁷ = 12113863 is a prime.

It is a super-3 number, since 3×12113991³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12113993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8646 + ... + 9948.

Almost surely, 2^12113991 is an apocalyptic number.

12113991 is a deficient number, since it is larger than the sum of its proper divisors (5414377).

12113991 is a wasteful number, since it uses less digits than its factorization.

12113991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2342 (or 2339 counting only the distinct ones).

The product of its digits is 486, while the sum is 27.

The square root of 12113991 is about 3480.5159100340. The cubic root of 12113991 is about 229.6654935740.

It can be divided in two parts, 12 and 113991, that added together give a triangular number (114003 = T₄₇₇).

The spelling of 12113991 in words is "twelve million, one hundred thirteen thousand, nine hundred ninety-one".