91395569 has 2 divisors, whose sum is σ = 91395570. Its totient is φ = 91395568.

The previous prime is 91395547. The next prime is 91395599. The reversal of 91395569 is 96559319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90003169 + 1392400 = 9487^2 + 1180^2 .

It is an emirp because it is prime and its reverse (96559319) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91395569 is a prime.

It is a super-2 number, since 2×91395569² = 16706300065667522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91395539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45697784 + 45697785.

It is an arithmetic number, because the mean of its divisors is an integer number (45697785).

Almost surely, 2^91395569 is an apocalyptic number.

It is an amenable number.

91395569 is a deficient number, since it is larger than the sum of its proper divisors (1).

91395569 is an equidigital number, since it uses as much as digits as its factorization.

91395569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 328050, while the sum is 47.

The square root of 91395569 is about 9560.1029806169. The cubic root of 91395569 is about 450.4449409861. Note that the first 3 decimals are identical.

The spelling of 91395569 in words is "ninety-one million, three hundred ninety-five thousand, five hundred sixty-nine".