91126591 has 2 divisors, whose sum is σ = 91126592. Its totient is φ = 91126590.

The previous prime is 91126549. The next prime is 91126631. The reversal of 91126591 is 19562119.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91126591 - 2¹³ = 91118399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91126501) 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, 45563295 + 45563296.

It is an arithmetic number, because the mean of its divisors is an integer number (45563296).

Almost surely, 2^91126591 is an apocalyptic number.

91126591 is a deficient number, since it is larger than the sum of its proper divisors (1).

91126591 is an equidigital number, since it uses as much as digits as its factorization.

91126591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 34.

The square root of 91126591 is about 9546.0248794983. The cubic root of 91126591 is about 450.0026189148.

The spelling of 91126591 in words is "ninety-one million, one hundred twenty-six thousand, five hundred ninety-one".