1206222155 has 4 divisors (see below), whose sum is σ = 1447466592. Its totient is φ = 964977720.

The previous prime is 1206222133. The next prime is 1206222179. The reversal of 1206222155 is 5512226021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1206222155 - 2¹⁸ = 1205960011 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120622211 + ... + 120622220.

It is an arithmetic number, because the mean of its divisors is an integer number (361866648).

Almost surely, 2^1206222155 is an apocalyptic number.

1206222155 is a deficient number, since it is larger than the sum of its proper divisors (241244437).

1206222155 is an equidigital number, since it uses as much as digits as its factorization.

1206222155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241244436.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1206222155 is about 34730.7091059195. The cubic root of 1206222155 is about 1064.4920778121.

Adding to 1206222155 its reverse (5512226021), we get a palindrome (6718448176).

The spelling of 1206222155 in words is "one billion, two hundred six million, two hundred twenty-two thousand, one hundred fifty-five".