91169291 has 4 divisors (see below), whose sum is σ = 91305432. Its totient is φ = 91033152.

The previous prime is 91169261. The next prime is 91169297. The reversal of 91169291 is 19296119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19296119 = 139 ⋅138821.

It is a cyclic number.

It is not a de Polignac number, because 91169291 - 2⁶ = 91169227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91169297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67061 + ... + 68406.

It is an arithmetic number, because the mean of its divisors is an integer number (22826358).

Almost surely, 2^91169291 is an apocalyptic number.

91169291 is a deficient number, since it is larger than the sum of its proper divisors (136141).

91169291 is a wasteful number, since it uses less digits than its factorization.

91169291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136140.

The product of its digits is 8748, while the sum is 38.

The square root of 91169291 is about 9548.2611505970. The cubic root of 91169291 is about 450.0728951870.

The spelling of 91169291 in words is "ninety-one million, one hundred sixty-nine thousand, two hundred ninety-one".