111981059 has 2 divisors, whose sum is σ = 111981060. Its totient is φ = 111981058.

The previous prime is 111981019. The next prime is 111981061. The reversal of 111981059 is 950189111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111981059 - 2²⁰ = 110932483 is a prime.

It is a super-2 number, since 2×111981059² = 25079515149522962, which contains 22 as substring.

Together with 111981061, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111981019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55990529 + 55990530.

It is an arithmetic number, because the mean of its divisors is an integer number (55990530).

Almost surely, 2^111981059 is an apocalyptic number.

111981059 is a deficient number, since it is larger than the sum of its proper divisors (1).

111981059 is an equidigital number, since it uses as much as digits as its factorization.

111981059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 35.

The square root of 111981059 is about 10582.1103282852. The cubic root of 111981059 is about 482.0012783837.

The spelling of 111981059 in words is "one hundred eleven million, nine hundred eighty-one thousand, fifty-nine".