91898111 has 2 divisors, whose sum is σ = 91898112. Its totient is φ = 91898110.

The previous prime is 91898101. The next prime is 91898123. The reversal of 91898111 is 11189819.

It is a weak prime.

It is an emirp because it is prime and its reverse (11189819) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91898111 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91898101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45949055 + 45949056.

It is an arithmetic number, because the mean of its divisors is an integer number (45949056).

Almost surely, 2^91898111 is an apocalyptic number.

91898111 is a deficient number, since it is larger than the sum of its proper divisors (1).

91898111 is an equidigital number, since it uses as much as digits as its factorization.

91898111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 38.

The square root of 91898111 is about 9586.3502439667. The cubic root of 91898111 is about 451.2690285942.

The spelling of 91898111 in words is "ninety-one million, eight hundred ninety-eight thousand, one hundred eleven".