91097969 has 2 divisors, whose sum is σ = 91097970. Its totient is φ = 91097968.

The previous prime is 91097921. The next prime is 91097971. The reversal of 91097969 is 96979019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88585744 + 2512225 = 9412^2 + 1585^2 .

It is an emirp because it is prime and its reverse (96979019) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91097969 is a prime.

It is a super-2 number, since 2×91097969² = 16597679911849922, which contains 22 as substring.

Together with 91097971, 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 (91097569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45548984 + 45548985.

It is an arithmetic number, because the mean of its divisors is an integer number (45548985).

Almost surely, 2^91097969 is an apocalyptic number.

It is an amenable number.

91097969 is a deficient number, since it is larger than the sum of its proper divisors (1).

91097969 is an equidigital number, since it uses as much as digits as its factorization.

91097969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 275562, while the sum is 50.

The square root of 91097969 is about 9544.5256037165. The cubic root of 91097969 is about 449.9555001264.

The spelling of 91097969 in words is "ninety-one million, ninety-seven thousand, nine hundred sixty-nine".