1009191009090 has 64 divisors (see below), whose sum is σ = 2644043046912. Its totient is φ = 244485931200.

The previous prime is 1009191009059. The next prime is 1009191009097. The reversal of 1009191009090 is 909001919001.

It is not an unprimeable number, because it can be changed into a prime (1009191009097) 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, 554052 + ... + 1524911.

It is an arithmetic number, because the mean of its divisors is an integer number (41313172608).

Almost surely, 2^{1009191009090} is an apocalyptic number.

1009191009090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1009191009090 is an abundant number, since it is smaller than the sum of its proper divisors (1634852037822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1009191009090 is a wasteful number, since it uses less digits than its factorization.

1009191009090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080455.

The product of its (nonzero) digits is 6561, while the sum is 39.

The spelling of 1009191009090 in words is "one trillion, nine billion, one hundred ninety-one million, nine thousand, ninety".