1019181920201 has 6 divisors (see below), whose sum is σ = 1029372750606. Its totient is φ = 1009091000000.

The previous prime is 1019181920149. The next prime is 1019181920209. The reversal of 1019181920201 is 1020291819101.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 716875489225 + 302306430976 = 846685^2 + 549824^2 .

It is not a de Polignac number, because 1019181920201 - 2¹⁰ = 1019181919177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1019181920209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49944800 + ... + 49965201.

It is an arithmetic number, because the mean of its divisors is an integer number (171562125101).

Almost surely, 2^{1019181920201} is an apocalyptic number.

It is an amenable number.

1019181920201 is a deficient number, since it is larger than the sum of its proper divisors (10190830405).

1019181920201 is an frugal number, since it uses more digits than its factorization.

1019181920201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99910203 (or 99910102 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 1019181920201 in words is "one trillion, nineteen billion, one hundred eighty-one million, nine hundred twenty thousand, two hundred one".