1215203055 has 32 divisors (see below), whose sum is σ = 2133831168. Its totient is φ = 585648000.

The previous prime is 1215203051. The next prime is 1215203057. The reversal of 1215203055 is 5503025121.

It is a happy number.

It is not a de Polignac number, because 1215203055 - 2² = 1215203051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215203051) 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 31 ways as a sum of consecutive naturals, for example, 5505 + ... + 49605.

It is an arithmetic number, because the mean of its divisors is an integer number (66682224).

Almost surely, 2^1215203055 is an apocalyptic number.

1215203055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1215203055 is a deficient number, since it is larger than the sum of its proper divisors (918628113).

1215203055 is a wasteful number, since it uses less digits than its factorization.

1215203055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44287.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 1215203055 is about 34859.7626928239. The cubic root of 1215203055 is about 1067.1274320663.

Adding to 1215203055 its reverse (5503025121), we get a palindrome (6718228176).

The spelling of 1215203055 in words is "one billion, two hundred fifteen million, two hundred three thousand, fifty-five".