1200012001 has 2 divisors, whose sum is σ = 1200012002. Its totient is φ = 1200012000.

The previous prime is 1200011987. The next prime is 1200012019. The reversal of 1200012001 is 1002100021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 980942400 + 219069601 = 31320^2 + 14801^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200012001 - 2¹⁵ = 1199979233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200012101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600006000 + 600006001.

It is an arithmetic number, because the mean of its divisors is an integer number (600006001).

Almost surely, 2^1200012001 is an apocalyptic number.

It is an amenable number.

1200012001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200012001 is an equidigital number, since it uses as much as digits as its factorization.

1200012001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1200012001 is about 34641.1893704590. The cubic root of 1200012001 is about 1062.6621116612.

Adding to 1200012001 its reverse (1002100021), we get a palindrome (2202112022).

The spelling of 1200012001 in words is "one billion, two hundred million, twelve thousand, one".