1215785055 has 8 divisors (see below), whose sum is σ = 1945256112. Its totient is φ = 648418688.

The previous prime is 1215785047. The next prime is 1215785069. The reversal of 1215785055 is 5505875121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1215785055 - 2³ = 1215785047 is a prime.

It is a super-2 number, since 2×1215785055² = 2956266599922706050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 40526154 + ... + 40526183.

It is an arithmetic number, because the mean of its divisors is an integer number (243157014).

Almost surely, 2^1215785055 is an apocalyptic number.

1215785055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1215785055 is a deficient number, since it is larger than the sum of its proper divisors (729471057).

1215785055 is an equidigital number, since it uses as much as digits as its factorization.

1215785055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81052345.

The product of its (nonzero) digits is 70000, while the sum is 39.

The square root of 1215785055 is about 34868.1094268101. The cubic root of 1215785055 is about 1067.2977654767.

The spelling of 1215785055 in words is "one billion, two hundred fifteen million, seven hundred eighty-five thousand, fifty-five".