90911909 has 8 divisors (see below), whose sum is σ = 99287040. Its totient is φ = 82555200.

The previous prime is 90911851. The next prime is 90911917.

It is a happy number.

90911909 is nontrivially palindromic in base 10.

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 90911909 - 2¹⁶ = 90846373 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 (90911929) 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, 7004 + ... + 15194.

It is an arithmetic number, because the mean of its divisors is an integer number (12410880).

Almost surely, 2^90911909 is an apocalyptic number.

It is an amenable number.

90911909 is a deficient number, since it is larger than the sum of its proper divisors (8375131).

90911909 is a wasteful number, since it uses less digits than its factorization.

90911909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9211.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 90911909 is about 9534.7736732447. The cubic root of 90911909 is about 449.6489591493.

The spelling of 90911909 in words is "ninety million, nine hundred eleven thousand, nine hundred nine".