91089727 has 2 divisors, whose sum is σ = 91089728. Its totient is φ = 91089726.

The previous prime is 91089721. The next prime is 91089773. The reversal of 91089727 is 72798019.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91089727 - 2⁷ = 91089599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91089721) 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, 45544863 + 45544864.

It is an arithmetic number, because the mean of its divisors is an integer number (45544864).

Almost surely, 2^91089727 is an apocalyptic number.

91089727 is a deficient number, since it is larger than the sum of its proper divisors (1).

91089727 is an equidigital number, since it uses as much as digits as its factorization.

91089727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 91089727 is about 9544.0938281222. The cubic root of 91089727 is about 449.9419299553.

The spelling of 91089727 in words is "ninety-one million, eighty-nine thousand, seven hundred twenty-seven".