111191089 has 2 divisors, whose sum is σ = 111191090. Its totient is φ = 111191088.

The previous prime is 111191071. The next prime is 111191099. The reversal of 111191089 is 980191111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108576400 + 2614689 = 10420^2 + 1617^2 .

It is a cyclic number.

It is not a de Polignac number, because 111191089 - 2⁹ = 111190577 is a prime.

It is equal to p_6367540 and since 111191089 and 6367540 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111191089.

It is not a weakly prime, because it can be changed into another prime (111191099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55595544 + 55595545.

It is an arithmetic number, because the mean of its divisors is an integer number (55595545).

Almost surely, 2^111191089 is an apocalyptic number.

It is an amenable number.

111191089 is a deficient number, since it is larger than the sum of its proper divisors (1).

111191089 is an equidigital number, since it uses as much as digits as its factorization.

111191089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 31.

The square root of 111191089 is about 10544.7185358358. The cubic root of 111191089 is about 480.8651771802.

The spelling of 111191089 in words is "one hundred eleven million, one hundred ninety-one thousand, eighty-nine".