9091819091 has 8 divisors (see below), whose sum is σ = 9283647504. Its totient is φ = 8901809280.

The previous prime is 9091819081. The next prime is 9091819123. The reversal of 9091819091 is 1909181909.

It is a happy number.

9091819091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9091819091 - 2¹⁰ = 9091818067 is a prime.

It is a super-2 number, since 2×9091819091² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9091819031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444545 + ... + 464546.

It is an arithmetic number, because the mean of its divisors is an integer number (1160455938).

Almost surely, 2^9091819091 is an apocalyptic number.

9091819091 is a deficient number, since it is larger than the sum of its proper divisors (191828413).

9091819091 is a wasteful number, since it uses less digits than its factorization.

9091819091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909301.

The product of its (nonzero) digits is 52488, while the sum is 47.

The square root of 9091819091 is about 95351.0308858798. The cubic root of 9091819091 is about 2087.1336584763.

The spelling of 9091819091 in words is "nine billion, ninety-one million, eight hundred nineteen thousand, ninety-one".