1205251211 has 4 divisors (see below), whose sum is σ = 1234647624. Its totient is φ = 1175854800.

The previous prime is 1205251207. The next prime is 1205251231. The reversal of 1205251211 is 1121525021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1121525021 = 12379 ⋅90599.

It is a cyclic number.

It is not a de Polignac number, because 1205251211 - 2² = 1205251207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205251231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14698145 + ... + 14698226.

It is an arithmetic number, because the mean of its divisors is an integer number (308661906).

Almost surely, 2^1205251211 is an apocalyptic number.

1205251211 is a deficient number, since it is larger than the sum of its proper divisors (29396413).

1205251211 is an equidigital number, since it uses as much as digits as its factorization.

1205251211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29396412.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1205251211 is about 34716.7281148440. The cubic root of 1205251211 is about 1064.2063815063.

Adding to 1205251211 its reverse (1121525021), we get a palindrome (2326776232).

The spelling of 1205251211 in words is "one billion, two hundred five million, two hundred fifty-one thousand, two hundred eleven".