1009181910091 has 4 divisors (see below), whose sum is σ = 1010143953000. Its totient is φ = 1008219867184.

The previous prime is 1009181910067. The next prime is 1009181910101. The reversal of 1009181910091 is 1900191819001.

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 1009181910091 - 2²³ = 1009173521483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1009181910001) 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, 481019881 + ... + 481021978.

It is an arithmetic number, because the mean of its divisors is an integer number (252535988250).

Almost surely, 2^{1009181910091} is an apocalyptic number.

1009181910091 is a deficient number, since it is larger than the sum of its proper divisors (962042909).

1009181910091 is an equidigital number, since it uses as much as digits as its factorization.

1009181910091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962042908.

The product of its (nonzero) digits is 5832, while the sum is 40.

The spelling of 1009181910091 in words is "one trillion, nine billion, one hundred eighty-one million, nine hundred ten thousand, ninety-one".