91086691 has 2 divisors, whose sum is σ = 91086692. Its totient is φ = 91086690.

The previous prime is 91086689. The next prime is 91086733. The reversal of 91086691 is 19668019.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91086691 - 2¹ = 91086689 is a prime.

Together with 91086689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91086641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45543345 + 45543346.

It is an arithmetic number, because the mean of its divisors is an integer number (45543346).

Almost surely, 2^91086691 is an apocalyptic number.

91086691 is a deficient number, since it is larger than the sum of its proper divisors (1).

91086691 is an equidigital number, since it uses as much as digits as its factorization.

91086691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 91086691 is about 9543.9347755525. The cubic root of 91086691 is about 449.9369310788.

The spelling of 91086691 in words is "ninety-one million, eighty-six thousand, six hundred ninety-one".