1011881189209 has 4 divisors (see below), whose sum is σ = 1103870388240. Its totient is φ = 919891990180.

The previous prime is 1011881189201. The next prime is 1011881189227. The reversal of 1011881189209 is 9029811881101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1011881189209 - 2³ = 1011881189201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011881189201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45994599499 + ... + 45994599520.

It is an arithmetic number, because the mean of its divisors is an integer number (275967597060).

Almost surely, 2^{1011881189209} is an apocalyptic number.

It is an amenable number.

1011881189209 is a deficient number, since it is larger than the sum of its proper divisors (91989199031).

1011881189209 is an equidigital number, since it uses as much as digits as its factorization.

1011881189209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91989199030.

The product of its (nonzero) digits is 82944, while the sum is 49.

The spelling of 1011881189209 in words is "one trillion, eleven billion, eight hundred eighty-one million, one hundred eighty-nine thousand, two hundred nine".