11111431 has 2 divisors, whose sum is σ = 11111432. Its totient is φ = 11111430.

The previous prime is 11111417. The next prime is 11111491. The reversal of 11111431 is 13411111.

It is a happy number.

11111431 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11111431 - 2²¹ = 9014279 is a prime.

It is a super-2 number, since 2×11111431² = 246927797735522, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555715 + 5555716.

It is an arithmetic number, because the mean of its divisors is an integer number (5555716).

Almost surely, 2^11111431 is an apocalyptic number.

11111431 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111431 is an equidigital number, since it uses as much as digits as its factorization.

11111431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12, while the sum is 13.

The square root of 11111431 is about 3333.3813163213. The cubic root of 11111431 is about 223.1464581151.

Adding to 11111431 its reverse (13411111), we get a palindrome (24522542).

The spelling of 11111431 in words is "eleven million, one hundred eleven thousand, four hundred thirty-one".