1000001200001 has 4 divisors (see below), whose sum is σ = 1000035772500. Its totient is φ = 999966627504.

The previous prime is 1000001199997. The next prime is 1000001200013. The reversal of 1000001200001 is 1000021000001.

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 640000000000 + 360001200001 = 800000^2 + 600001^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000001200001 - 2² = 1000001199997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000001200801) 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, 17242826 + ... + 17300723.

It is an arithmetic number, because the mean of its divisors is an integer number (250008943125).

Almost surely, 2^{1000001200001} is an apocalyptic number.

It is an amenable number.

1000001200001 is a deficient number, since it is larger than the sum of its proper divisors (34572499).

1000001200001 is an equidigital number, since it uses as much as digits as its factorization.

1000001200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34572498.

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 1000001200001 its reverse (1000021000001), we get a palindrome (2000022200002).

The spelling of 1000001200001 in words is "one trillion, one million, two hundred thousand, one".