111597919 has 2 divisors, whose sum is σ = 111597920. Its totient is φ = 111597918.

The previous prime is 111597847. The next prime is 111597929. The reversal of 111597919 is 919795111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111597919 is a prime.

It is a super-2 number, since 2×111597919² = 24908191050261122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111597929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55798959 + 55798960.

It is an arithmetic number, because the mean of its divisors is an integer number (55798960).

Almost surely, 2^111597919 is an apocalyptic number.

111597919 is a deficient number, since it is larger than the sum of its proper divisors (1).

111597919 is an equidigital number, since it uses as much as digits as its factorization.

111597919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25515, while the sum is 43.

The square root of 111597919 is about 10563.9916224882. The cubic root of 111597919 is about 481.4509323650.

The spelling of 111597919 in words is "one hundred eleven million, five hundred ninety-seven thousand, nine hundred nineteen".