1200020001 has 16 divisors (see below), whose sum is σ = 1644729984. Its totient is φ = 777700224.

The previous prime is 1200019979. The next prime is 1200020023. The reversal of 1200020001 is 1000200021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1200019979) and next prime (1200020023).

It is not a de Polignac number, because 1200020001 - 2⁹ = 1200019489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200020051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140485 + ... + 148781.

It is an arithmetic number, because the mean of its divisors is an integer number (102795624).

Almost surely, 2^1200020001 is an apocalyptic number.

It is an amenable number.

1200020001 is a deficient number, since it is larger than the sum of its proper divisors (444709983).

1200020001 is a wasteful number, since it uses less digits than its factorization.

1200020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9640.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1200020001 is about 34641.3048397430. The cubic root of 1200020001 is about 1062.6644731037.

Adding to 1200020001 its reverse (1000200021), we get a palindrome (2200220022).

It can be divided in two parts, 1 and 200020001, that added together give a palindrome (200020002).

The spelling of 1200020001 in words is "one billion, two hundred million, twenty thousand, one".