91089011 has 8 divisors (see below), whose sum is σ = 98997360. Its totient is φ = 83309472.

The previous prime is 91089001. The next prime is 91089023. The reversal of 91089011 is 11098019.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91089011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91089001) 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, 30725 + ... + 33558.

It is an arithmetic number, because the mean of its divisors is an integer number (12374670).

Almost surely, 2^91089011 is an apocalyptic number.

91089011 is a deficient number, since it is larger than the sum of its proper divisors (7908349).

91089011 is a wasteful number, since it uses less digits than its factorization.

91089011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64405.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 91089011 is about 9544.0563179395. The cubic root of 91089011 is about 449.9407510471.

The spelling of 91089011 in words is "ninety-one million, eighty-nine thousand, eleven".