1019444697809 has 4 divisors (see below), whose sum is σ = 1019756362560. Its totient is φ = 1019133033060.

The previous prime is 1019444697779. The next prime is 1019444697827. The reversal of 1019444697809 is 9087964449101.

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 1019444697809 - 2⁸ = 1019444697553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1019444697889) 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, 155827469 + ... + 155834010.

It is an arithmetic number, because the mean of its divisors is an integer number (254939090640).

Almost surely, 2^{1019444697809} is an apocalyptic number.

It is an amenable number.

1019444697809 is a deficient number, since it is larger than the sum of its proper divisors (311664751).

1019444697809 is an equidigital number, since it uses as much as digits as its factorization.

1019444697809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311664750.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 1019444697809 in words is "one trillion, nineteen billion, four hundred forty-four million, six hundred ninety-seven thousand, eight hundred nine".