1000201111001 has 4 divisors (see below), whose sum is σ = 1002646590900. Its totient is φ = 997755631104.

The previous prime is 1000201110991. The next prime is 1000201111033. The reversal of 1000201111001 is 1001111020001.

It is a happy number.

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 405877297225 + 594323813776 = 637085^2 + 770924^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000201111001 - 2²⁶ = 1000134002137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1000201111001.

It is not an unprimeable number, because it can be changed into a prime (1000201111051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1222739336 + ... + 1222740153.

It is an arithmetic number, because the mean of its divisors is an integer number (250661647725).

Almost surely, 2^{1000201111001} is an apocalyptic number.

It is an amenable number.

1000201111001 is a deficient number, since it is larger than the sum of its proper divisors (2445479899).

1000201111001 is an equidigital number, since it uses as much as digits as its factorization.

1000201111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445479898.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 1000201111001 its reverse (1001111020001), we get a palindrome (2001312131002).

The spelling of 1000201111001 in words is "one trillion, two hundred one million, one hundred eleven thousand, one".