111111331 has 2 divisors, whose sum is σ = 111111332. Its totient is φ = 111111330.

The previous prime is 111111323. The next prime is 111111359. The reversal of 111111331 is 133111111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111111331 - 2³ = 111111323 is a prime.

It is a super-2 number, since 2×111111331² = 24691455753183122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111111361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555665 + 55555666.

It is an arithmetic number, because the mean of its divisors is an integer number (55555666).

Almost surely, 2^111111331 is an apocalyptic number.

111111331 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111331 is an equidigital number, since it uses as much as digits as its factorization.

111111331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9, while the sum is 13.

The square root of 111111331 is about 10540.9359641353. The cubic root of 111111331 is about 480.7501739036.

Adding to 111111331 its reverse (133111111), we get a palindrome (244222442).

It can be divided in two parts, 11111 and 1331, that multiplied together give a palindrome (14788741).

The spelling of 111111331 in words is "one hundred eleven million, one hundred eleven thousand, three hundred thirty-one".