1213225755 has 16 divisors (see below), whose sum is σ = 2218470144. Its totient is φ = 554617440.

The previous prime is 1213225751. The next prime is 1213225771. The reversal of 1213225755 is 5575223121.

It is not a de Polignac number, because 1213225755 - 2² = 1213225751 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213225751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5777161 + ... + 5777370.

It is an arithmetic number, because the mean of its divisors is an integer number (138654384).

Almost surely, 2^1213225755 is an apocalyptic number.

1213225755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1213225755 is a deficient number, since it is larger than the sum of its proper divisors (1005244389).

1213225755 is a wasteful number, since it uses less digits than its factorization.

1213225755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11554546.

The product of its digits is 21000, while the sum is 33.

The square root of 1213225755 is about 34831.3903684593. The cubic root of 1213225755 is about 1066.5483308936.

Adding to 1213225755 its reverse (5575223121), we get a palindrome (6788448876).

The spelling of 1213225755 in words is "one billion, two hundred thirteen million, two hundred twenty-five thousand, seven hundred fifty-five".