9181919091 has 8 divisors (see below), whose sum is σ = 12243941824. Its totient is φ = 6120587880.

The previous prime is 9181919041. The next prime is 9181919093. The reversal of 9181919091 is 1909191819.

It is a happy number.

9181919091 is digitally balanced in base 3, 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 not a de Polignac number, because 9181919091 - 2⁹ = 9181918579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9181919091.

It is not an unprimeable number, because it can be changed into a prime (9181919093) 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, 141061 + ... + 195606.

It is an arithmetic number, because the mean of its divisors is an integer number (1530492728).

Almost surely, 2^9181919091 is an apocalyptic number.

9181919091 is a deficient number, since it is larger than the sum of its proper divisors (3062022733).

9181919091 is a wasteful number, since it uses less digits than its factorization.

9181919091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345761.

The product of its (nonzero) digits is 52488, while the sum is 48.

The square root of 9181919091 is about 95822.3308576868. The cubic root of 9181919091 is about 2094.0055119362.

The spelling of 9181919091 in words is "nine billion, one hundred eighty-one million, nine hundred nineteen thousand, ninety-one".