91091063 has 16 divisors (see below), whose sum is σ = 109057536. Its totient is φ = 74389920.

The previous prime is 91091041. The next prime is 91091081. The reversal of 91091063 is 36019019.

It is a cyclic number.

It is not a de Polignac number, because 91091063 - 2¹² = 91086967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91091023) 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 in 15 ways as a sum of consecutive naturals, for example, 46208 + ... + 48138.

It is an arithmetic number, because the mean of its divisors is an integer number (6816096).

Almost surely, 2^91091063 is an apocalyptic number.

91091063 is a deficient number, since it is larger than the sum of its proper divisors (17966473).

91091063 is a wasteful number, since it uses less digits than its factorization.

91091063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 91091063 is about 9544.1638187952. The cubic root of 91091063 is about 449.9441296892.

The spelling of 91091063 in words is "ninety-one million, ninety-one thousand, sixty-three".