91089113 has 8 divisors (see below), whose sum is σ = 92664960. Its totient is φ = 89519760.

The previous prime is 91089109. The next prime is 91089121. The reversal of 91089113 is 31198019.

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

It is a cyclic number.

It is not a de Polignac number, because 91089113 - 2² = 91089109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91089113.

It is not an unprimeable number, because it can be changed into a prime (91089143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32768 + ... + 35438.

It is an arithmetic number, because the mean of its divisors is an integer number (11583120).

Almost surely, 2^91089113 is an apocalyptic number.

It is an amenable number.

91089113 is a deficient number, since it is larger than the sum of its proper divisors (1575847).

91089113 is a wasteful number, since it uses less digits than its factorization.

91089113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 91089113 is about 9544.0616615778. The cubic root of 91089113 is about 449.9409189925.

The spelling of 91089113 in words is "ninety-one million, eighty-nine thousand, one hundred thirteen".