111321391 has 2 divisors, whose sum is σ = 111321392. Its totient is φ = 111321390.

The previous prime is 111321383. The next prime is 111321407. The reversal of 111321391 is 193123111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111321391 - 2³ = 111321383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111351391) 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, 55660695 + 55660696.

It is an arithmetic number, because the mean of its divisors is an integer number (55660696).

Almost surely, 2^111321391 is an apocalyptic number.

111321391 is a deficient number, since it is larger than the sum of its proper divisors (1).

111321391 is an equidigital number, since it uses as much as digits as its factorization.

111321391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 22.

The square root of 111321391 is about 10550.8952700707. The cubic root of 111321391 is about 481.0529417308.

The spelling of 111321391 in words is "one hundred eleven million, three hundred twenty-one thousand, three hundred ninety-one".