111097891 has 2 divisors, whose sum is σ = 111097892. Its totient is φ = 111097890.

The previous prime is 111097837. The next prime is 111097933. The reversal of 111097891 is 198790111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111097891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111097891.

It is not a weakly prime, because it can be changed into another prime (111097691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55548945 + 55548946.

It is an arithmetic number, because the mean of its divisors is an integer number (55548946).

Almost surely, 2^111097891 is an apocalyptic number.

111097891 is a deficient number, since it is larger than the sum of its proper divisors (1).

111097891 is an equidigital number, since it uses as much as digits as its factorization.

111097891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 37.

The square root of 111097891 is about 10540.2984303102. The cubic root of 111097891 is about 480.7307893133.

The spelling of 111097891 in words is "one hundred eleven million, ninety-seven thousand, eight hundred ninety-one".