1205542211 has 4 divisors (see below), whose sum is σ = 1205621424. Its totient is φ = 1205463000.

The previous prime is 1205542183. The next prime is 1205542213. The reversal of 1205542211 is 1122455021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1122455021 = 1321 ⋅849701.

It is a cyclic number.

It is not a de Polignac number, because 1205542211 - 2¹⁰ = 1205541187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205542213) 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, 8780 + ... + 49881.

It is an arithmetic number, because the mean of its divisors is an integer number (301405356).

Almost surely, 2^1205542211 is an apocalyptic number.

1205542211 is a deficient number, since it is larger than the sum of its proper divisors (79213).

1205542211 is an equidigital number, since it uses as much as digits as its factorization.

1205542211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79212.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1205542211 is about 34720.9189250515. The cubic root of 1205542211 is about 1064.2920231645.

Adding to 1205542211 its reverse (1122455021), we get a palindrome (2327997232).

The spelling of 1205542211 in words is "one billion, two hundred five million, five hundred forty-two thousand, two hundred eleven".