91089886 has 8 divisors (see below), whose sum is σ = 137072304. Its totient is φ = 45399120.

The previous prime is 91089853. The next prime is 91089937. The reversal of 91089886 is 68898019.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 72130 + ... + 73381.

It is an arithmetic number, because the mean of its divisors is an integer number (17134038).

Almost surely, 2^91089886 is an apocalyptic number.

91089886 is a deficient number, since it is larger than the sum of its proper divisors (45982418).

91089886 is a wasteful number, since it uses less digits than its factorization.

91089886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145826.

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 91089886 is about 9544.1021578774. The cubic root of 91089886 is about 449.9421917511.

The spelling of 91089886 in words is "ninety-one million, eighty-nine thousand, eight hundred eighty-six".