1009091909191 has 4 divisors (see below), whose sum is σ = 1009296307872. Its totient is φ = 1008887510512.

The previous prime is 1009091909153. The next prime is 1009091909207. The reversal of 1009091909191 is 1919091909001.

It is a happy number.

1009091909191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 1009091909191 - 2²¹ = 1009089812039 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 (1009091909131) 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, 102191935 + ... + 102201808.

It is an arithmetic number, because the mean of its divisors is an integer number (252324076968).

Almost surely, 2^{1009091909191} is an apocalyptic number.

1009091909191 is a deficient number, since it is larger than the sum of its proper divisors (204398681).

1009091909191 is an equidigital number, since it uses as much as digits as its factorization.

1009091909191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204398680.

The product of its (nonzero) digits is 59049, while the sum is 49.

The spelling of 1009091909191 in words is "one trillion, nine billion, ninety-one million, nine hundred nine thousand, one hundred ninety-one".