1900001100001 has 4 divisors (see below), whose sum is σ = 1900077500692. Its totient is φ = 1899924699312.

The previous prime is 1900001099989. The next prime is 1900001100061. The reversal of 1900001100001 is 1000011000091.

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 597720719376 + 1302280380625 = 773124^2 + 1141175^2 .

It is a cyclic number.

It is not a de Polignac number, because 1900001100001 - 2²¹ = 1899999002849 is a prime.

It is a super-2 number, since 2×1900001100001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1900001100061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38163030 + ... + 38212783.

It is an arithmetic number, because the mean of its divisors is an integer number (475019375173).

Almost surely, 2^{1900001100001} is an apocalyptic number.

It is an amenable number.

1900001100001 is a deficient number, since it is larger than the sum of its proper divisors (76400691).

1900001100001 is an equidigital number, since it uses as much as digits as its factorization.

1900001100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76400690.

The product of its (nonzero) digits is 9, while the sum is 13.

Adding to 1900001100001 its reverse (1000011000091), we get a palindrome (2900012100092).

It can be divided in two parts, 1900001 and 100001, that added together give a palindrome (2000002).

The spelling of 1900001100001 in words is "one trillion, nine hundred billion, one million, one hundred thousand, one".