1019191919201 has 4 divisors (see below), whose sum is σ = 1029282928404. Its totient is φ = 1009100910000.

The previous prime is 1019191919171. The next prime is 1019191919203. The reversal of 1019191919201 is 1029191919101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 837634970176 + 181556949025 = 915224^2 + 426095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1019191919201 - 2²⁶ = 1019124810337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1019191919203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5045504450 + ... + 5045504651.

It is an arithmetic number, because the mean of its divisors is an integer number (257320732101).

Almost surely, 2^{1019191919201} is an apocalyptic number.

It is an amenable number.

1019191919201 is a deficient number, since it is larger than the sum of its proper divisors (10091009203).

1019191919201 is a wasteful number, since it uses less digits than its factorization.

1019191919201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10091009202.

The product of its (nonzero) digits is 13122, while the sum is 44.

Multiplying 1019191919201 by its sum of digits (44), we get a palindrome (44844444444844).

The spelling of 1019191919201 in words is "one trillion, nineteen billion, one hundred ninety-one million, nine hundred nineteen thousand, two hundred one".