91289591 has 2 divisors, whose sum is σ = 91289592. Its totient is φ = 91289590.

The previous prime is 91289587. The next prime is 91289641. The reversal of 91289591 is 19598219.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19598219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91289591 - 2² = 91289587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91289531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45644795 + 45644796.

It is an arithmetic number, because the mean of its divisors is an integer number (45644796).

Almost surely, 2^91289591 is an apocalyptic number.

91289591 is a deficient number, since it is larger than the sum of its proper divisors (1).

91289591 is an equidigital number, since it uses as much as digits as its factorization.

91289591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 44.

The square root of 91289591 is about 9554.5586501942. The cubic root of 91289591 is about 450.2707687308.

The spelling of 91289591 in words is "ninety-one million, two hundred eighty-nine thousand, five hundred ninety-one".