12191431 has 16 divisors (see below), whose sum is σ = 15038784. Its totient is φ = 9644544.

The previous prime is 12191429. The next prime is 12191441. The reversal of 12191431 is 13419121.

12191431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12191431 - 2¹ = 12191429 is a prime.

It is a super-2 number, since 2×12191431² = 297261979655522, which contains 22 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 (12191441) 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, 5341 + ... + 7273.

It is an arithmetic number, because the mean of its divisors is an integer number (939924).

Almost surely, 2^12191431 is an apocalyptic number.

12191431 is a deficient number, since it is larger than the sum of its proper divisors (2847353).

12191431 is a wasteful number, since it uses less digits than its factorization.

12191431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010.

The product of its digits is 216, while the sum is 22.

The square root of 12191431 is about 3491.6229750647. The cubic root of 12191431 is about 230.1538416255.

The spelling of 12191431 in words is "twelve million, one hundred ninety-one thousand, four hundred thirty-one".