111399919 has 2 divisors, whose sum is σ = 111399920. Its totient is φ = 111399918.

The previous prime is 111399887. The next prime is 111399931. The reversal of 111399919 is 919993111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111399919 - 2⁵ = 111399887 is a prime.

It is a super-2 number, since 2×111399919² = 24819883906413122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111399979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55699959 + 55699960.

It is an arithmetic number, because the mean of its divisors is an integer number (55699960).

Almost surely, 2^111399919 is an apocalyptic number.

111399919 is a deficient number, since it is larger than the sum of its proper divisors (1).

111399919 is an equidigital number, since it uses as much as digits as its factorization.

111399919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19683, while the sum is 43.

The square root of 111399919 is about 10554.6160043841. The cubic root of 111399919 is about 481.1660294489.

The spelling of 111399919 in words is "one hundred eleven million, three hundred ninety-nine thousand, nine hundred nineteen".