12111431 has 2 divisors, whose sum is σ = 12111432. Its totient is φ = 12111430.

The previous prime is 12111427. The next prime is 12111433. The reversal of 12111431 is 13411121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12111431 - 2² = 12111427 is a prime.

It is a super-2 number, since 2×12111431² = 293373521735522, which contains 22 as substring.

Together with 12111433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055715 + 6055716.

It is an arithmetic number, because the mean of its divisors is an integer number (6055716).

Almost surely, 2^12111431 is an apocalyptic number.

12111431 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111431 is an equidigital number, since it uses as much as digits as its factorization.

12111431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24, while the sum is 14.

The square root of 12111431 is about 3480.1481290313. The cubic root of 12111431 is about 229.6493143455.

Adding to 12111431 its reverse (13411121), we get a palindrome (25522552).

The spelling of 12111431 in words is "twelve million, one hundred eleven thousand, four hundred thirty-one".