1215855122 has 16 divisors (see below), whose sum is σ = 1837465344. Its totient is φ = 603384000.

The previous prime is 1215855103. The next prime is 1215855149. The reversal of 1215855122 is 2215585121.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 145847 + ... + 153957.

It is an arithmetic number, because the mean of its divisors is an integer number (114841584).

Almost surely, 2^1215855122 is an apocalyptic number.

1215855122 is a deficient number, since it is larger than the sum of its proper divisors (621610222).

1215855122 is a wasteful number, since it uses less digits than its factorization.

1215855122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8665.

The product of its digits is 8000, while the sum is 32.

The square root of 1215855122 is about 34869.1141556536. The cubic root of 1215855122 is about 1067.3182682554.

The spelling of 1215855122 in words is "one billion, two hundred fifteen million, eight hundred fifty-five thousand, one hundred twenty-two".