91158799 has 2 divisors, whose sum is σ = 91158800. Its totient is φ = 91158798.

The previous prime is 91158797. The next prime is 91158829. The reversal of 91158799 is 99785119.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91158799 - 2¹ = 91158797 is a prime.

Together with 91158797, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91158797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45579399 + 45579400.

It is an arithmetic number, because the mean of its divisors is an integer number (45579400).

Almost surely, 2^91158799 is an apocalyptic number.

91158799 is a deficient number, since it is larger than the sum of its proper divisors (1).

91158799 is an equidigital number, since it uses as much as digits as its factorization.

91158799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 49.

The square root of 91158799 is about 9547.7117153798. The cubic root of 91158799 is about 450.0556293368.

The spelling of 91158799 in words is "ninety-one million, one hundred fifty-eight thousand, seven hundred ninety-nine".