91362991 has 4 divisors (see below), whose sum is σ = 91569672. Its totient is φ = 91156312.

The previous prime is 91362989. The next prime is 91363007. The reversal of 91362991 is 19926319.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19926319 = 7 ⋅2846617.

It is a cyclic number.

It is not a de Polignac number, because 91362991 - 2¹ = 91362989 is a prime.

It is a super-2 number, since 2×91362991² = 16694392248932162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91362941) 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, 102676 + ... + 103561.

It is an arithmetic number, because the mean of its divisors is an integer number (22892418).

Almost surely, 2^91362991 is an apocalyptic number.

91362991 is a deficient number, since it is larger than the sum of its proper divisors (206681).

91362991 is a wasteful number, since it uses less digits than its factorization.

91362991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206680.

The product of its digits is 26244, while the sum is 40.

The square root of 91362991 is about 9558.3989768161. The cubic root of 91362991 is about 450.3914141781.

The spelling of 91362991 in words is "ninety-one million, three hundred sixty-two thousand, nine hundred ninety-one".