1009191919091 has 32 divisors (see below), whose sum is σ = 1058612545536. Its totient is φ = 961300224000.

The previous prime is 1009191919069. The next prime is 1009191919199. The reversal of 1009191919091 is 1909191919001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1009191919091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1009191919051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111005456 + ... + 111014546.

It is an arithmetic number, because the mean of its divisors is an integer number (33081642048).

Almost surely, 2^{1009191919091} is an apocalyptic number.

1009191919091 is a deficient number, since it is larger than the sum of its proper divisors (49420626445).

1009191919091 is a wasteful number, since it uses less digits than its factorization.

1009191919091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9603.

The product of its (nonzero) digits is 59049, while the sum is 50.

The spelling of 1009191919091 in words is "one trillion, nine billion, one hundred ninety-one million, nine hundred nineteen thousand, ninety-one".