1200020051 has 2 divisors, whose sum is σ = 1200020052. Its totient is φ = 1200020050.

The previous prime is 1200020039. The next prime is 1200020071. The reversal of 1200020051 is 1500200021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1200020051 - 2¹⁰ = 1200019027 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200020071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600010025 + 600010026.

It is an arithmetic number, because the mean of its divisors is an integer number (600010026).

Almost surely, 2^1200020051 is an apocalyptic number.

1200020051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200020051 is an equidigital number, since it uses as much as digits as its factorization.

1200020051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 1200020051 is about 34641.3055614248. The cubic root of 1200020051 is about 1062.6644878627.

Adding to 1200020051 its reverse (1500200021), we get a palindrome (2700220072).

The spelling of 1200020051 in words is "one billion, two hundred million, twenty thousand, fifty-one".