8190909091 has 4 divisors (see below), whose sum is σ = 8205105352. Its totient is φ = 8176712832.

The previous prime is 8190909019. The next prime is 8190909121. The reversal of 8190909091 is 1909090918.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8190909091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8190909011) 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, 7097265 + ... + 7098418.

It is an arithmetic number, because the mean of its divisors is an integer number (2051276338).

Almost surely, 2^8190909091 is an apocalyptic number.

8190909091 is a deficient number, since it is larger than the sum of its proper divisors (14196261).

8190909091 is a wasteful number, since it uses less digits than its factorization.

8190909091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14196260.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 8190909091 is about 90503.6413134853. The cubic root of 8190909091 is about 2015.7841928378.

The spelling of 8190909091 in words is "eight billion, one hundred ninety million, nine hundred nine thousand, ninety-one".