11431111 has 2 divisors, whose sum is σ = 11431112. Its totient is φ = 11431110.

The previous prime is 11431109. The next prime is 11431129. The reversal of 11431111 is 11113411.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11431111 - 2¹ = 11431109 is a prime.

It is a super-3 number, since 3×11431111³ (a number of 22 digits) contains 333 as substring.

Together with 11431109, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 11431091 and 11431100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11431151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5715555 + 5715556.

It is an arithmetic number, because the mean of its divisors is an integer number (5715556).

Almost surely, 2^11431111 is an apocalyptic number.

11431111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11431111 is an equidigital number, since it uses as much as digits as its factorization.

11431111 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 11431111 is about 3380.9926057299. The cubic root of 11431111 is about 225.2662592769.

Adding to 11431111 its reverse (11113411), we get a palindrome (22544522).

The spelling of 11431111 in words is "eleven million, four hundred thirty-one thousand, one hundred eleven".