1000203000001 has 4 divisors (see below), whose sum is σ = 1019074754772. Its totient is φ = 981331245232.

The previous prime is 1000202999989. The next prime is 1000203000029. The reversal of 1000203000001 is 1000003020001.

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 738652583601 + 261550416400 = 859449^2 + 511420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000203000001 - 2¹⁵ = 1000202967233 is a prime.

It is a super-2 number, since 2×1000203000001² (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 (1000203000061) 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, 9435877306 + ... + 9435877411.

It is an arithmetic number, because the mean of its divisors is an integer number (254768688693).

Almost surely, 2^{1000203000001} is an apocalyptic number.

It is an amenable number.

1000203000001 is a deficient number, since it is larger than the sum of its proper divisors (18871754771).

1000203000001 is an equidigital number, since it uses as much as digits as its factorization.

1000203000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18871754770.

The product of its (nonzero) digits is 6, while the sum is 7.

Adding to 1000203000001 its reverse (1000003020001), we get a palindrome (2000206020002).

The spelling of 1000203000001 in words is "one trillion, two hundred three million, one", and thus it is an aban number.