91144111 has 2 divisors, whose sum is σ = 91144112. Its totient is φ = 91144110.

The previous prime is 91144093. The next prime is 91144169. The reversal of 91144111 is 11144119.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91144111 - 2¹⁵ = 91111343 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 (91144171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45572055 + 45572056.

It is an arithmetic number, because the mean of its divisors is an integer number (45572056).

Almost surely, 2^91144111 is an apocalyptic number.

91144111 is a deficient number, since it is larger than the sum of its proper divisors (1).

91144111 is an equidigital number, since it uses as much as digits as its factorization.

91144111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 22.

The square root of 91144111 is about 9546.9424948514. The cubic root of 91144111 is about 450.0314562373.

It can be divided in two parts, 9114 and 4111, that added together give a square (13225 = 115²).

The spelling of 91144111 in words is "ninety-one million, one hundred forty-four thousand, one hundred eleven".