91096909 has 4 divisors (see below), whose sum is σ = 91118304. Its totient is φ = 91075516.

The previous prime is 91096903. The next prime is 91096913. The reversal of 91096909 is 90969019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90969019 = 659 ⋅138041.

It is a cyclic number.

It is not a de Polignac number, because 91096909 - 2¹⁹ = 90572621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91096903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1897 + ... + 13630.

It is an arithmetic number, because the mean of its divisors is an integer number (22779576).

Almost surely, 2^91096909 is an apocalyptic number.

It is an amenable number.

91096909 is a deficient number, since it is larger than the sum of its proper divisors (21395).

91096909 is a wasteful number, since it uses less digits than its factorization.

91096909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21394.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 91096909 is about 9544.4700743415. The cubic root of 91096909 is about 449.9537549185.

The spelling of 91096909 in words is "ninety-one million, ninety-six thousand, nine hundred nine".