91095997 has 4 divisors (see below), whose sum is σ = 92589436. Its totient is φ = 89602560.

The previous prime is 91095929. The next prime is 91096021. The reversal of 91095997 is 79959019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79959019 = 7 ⋅11422717.

It can be written as a sum of positive squares in 2 ways, for example, as 1490841 + 89605156 = 1221^2 + 9466^2 .

It is a cyclic number.

It is not a de Polignac number, because 91095997 - 2⁷ = 91095869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91095997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91095097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746628 + ... + 746749.

It is an arithmetic number, because the mean of its divisors is an integer number (23147359).

Almost surely, 2^91095997 is an apocalyptic number.

It is an amenable number.

91095997 is a deficient number, since it is larger than the sum of its proper divisors (1493439).

91095997 is a wasteful number, since it uses less digits than its factorization.

91095997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493438.

The product of its (nonzero) digits is 229635, while the sum is 49.

The square root of 91095997 is about 9544.4222978659. The cubic root of 91095997 is about 449.9522533703.

The spelling of 91095997 in words is "ninety-one million, ninety-five thousand, nine hundred ninety-seven".