91165397 has 2 divisors, whose sum is σ = 91165398. Its totient is φ = 91165396.

The previous prime is 91165381. The next prime is 91165421. The reversal of 91165397 is 79356119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77334436 + 13830961 = 8794^2 + 3719^2 .

It is a cyclic number.

It is not a de Polignac number, because 91165397 - 2⁴ = 91165381 is a prime.

It is a super-2 number, since 2×91165397² = 16622259220335218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91165367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45582698 + 45582699.

It is an arithmetic number, because the mean of its divisors is an integer number (45582699).

Almost surely, 2^91165397 is an apocalyptic number.

It is an amenable number.

91165397 is a deficient number, since it is larger than the sum of its proper divisors (1).

91165397 is an equidigital number, since it uses as much as digits as its factorization.

91165397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030, while the sum is 41.

The square root of 91165397 is about 9548.0572369462. The cubic root of 91165397 is about 450.0664872954.

The spelling of 91165397 in words is "ninety-one million, one hundred sixty-five thousand, three hundred ninety-seven".