1200100001 has 4 divisors (see below), whose sum is σ = 1200209712. Its totient is φ = 1199990292.

The previous prime is 1200099961. The next prime is 1200100019. The reversal of 1200100001 is 1000010021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1200100001 - 2⁶ = 1200099937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1200100081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36371 + ... + 61016.

It is an arithmetic number, because the mean of its divisors is an integer number (300052428).

Almost surely, 2^1200100001 is an apocalyptic number.

It is an amenable number.

1200100001 is a deficient number, since it is larger than the sum of its proper divisors (109711).

1200100001 is an equidigital number, since it uses as much as digits as its factorization.

1200100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109710.

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

The square root of 1200100001 is about 34642.4595114146. The cubic root of 1200100001 is about 1062.6880869515.

Adding to 1200100001 its reverse (1000010021), we get a palindrome (2200110022).

The spelling of 1200100001 in words is "one billion, two hundred million, one hundred thousand, one".