91144169 has 2 divisors, whose sum is σ = 91144170. Its totient is φ = 91144168.

The previous prime is 91144111. The next prime is 91144171. The reversal of 91144169 is 96144119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60762025 + 30382144 = 7795^2 + 5512^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91144169 is a prime.

It is a super-2 number, since 2×91144169² = 16614519085401122, which contains 22 as substring.

Together with 91144171, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91144069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45572084 + 45572085.

It is an arithmetic number, because the mean of its divisors is an integer number (45572085).

Almost surely, 2^91144169 is an apocalyptic number.

It is an amenable number.

91144169 is a deficient number, since it is larger than the sum of its proper divisors (1).

91144169 is an equidigital number, since it uses as much as digits as its factorization.

91144169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 91144169 is about 9546.9455324727. The cubic root of 91144169 is about 450.0315516972.

The spelling of 91144169 in words is "ninety-one million, one hundred forty-four thousand, one hundred sixty-nine".