1231222055 has 16 divisors (see below), whose sum is σ = 1692805440. Its totient is φ = 842130432.

The previous prime is 1231222051. The next prime is 1231222063. The reversal of 1231222055 is 5502221321.

It is a cyclic number.

It is not a de Polignac number, because 1231222055 - 2² = 1231222051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231222055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231222051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30410 + ... + 58199.

It is an arithmetic number, because the mean of its divisors is an integer number (105800340).

Almost surely, 2^1231222055 is an apocalyptic number.

1231222055 is a deficient number, since it is larger than the sum of its proper divisors (461583385).

1231222055 is an equidigital number, since it uses as much as digits as its factorization.

1231222055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89018.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1231222055 is about 35088.7739170237. The cubic root of 1231222055 is about 1071.7959923915.

Adding to 1231222055 its reverse (5502221321), we get a palindrome (6733443376).

The spelling of 1231222055 in words is "one billion, two hundred thirty-one million, two hundred twenty-two thousand, fifty-five".