230111891 has 2 divisors, whose sum is σ = 230111892. Its totient is φ = 230111890.

The previous prime is 230111873. The next prime is 230111899. The reversal of 230111891 is 198111032.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-230111891 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 230111891.

It is not a weakly prime, because it can be changed into another prime (230111899) 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, 115055945 + 115055946.

It is an arithmetic number, because the mean of its divisors is an integer number (115055946).

Almost surely, 2^230111891 is an apocalyptic number.

230111891 is a deficient number, since it is larger than the sum of its proper divisors (1).

230111891 is an equidigital number, since it uses as much as digits as its factorization.

230111891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 230111891 is about 15169.4393765887. The cubic root of 230111891 is about 612.7919061753.

The spelling of 230111891 in words is "two hundred thirty million, one hundred eleven thousand, eight hundred ninety-one".