1218215055 has 8 divisors (see below), whose sum is σ = 1949144112. Its totient is φ = 649714688.

The previous prime is 1218215051. The next prime is 1218215057. The reversal of 1218215055 is 5505128121.

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 1218215055 - 2² = 1218215051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218215051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40607154 + ... + 40607183.

It is an arithmetic number, because the mean of its divisors is an integer number (243643014).

Almost surely, 2^1218215055 is an apocalyptic number.

1218215055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1218215055 is a deficient number, since it is larger than the sum of its proper divisors (730929057).

1218215055 is an equidigital number, since it uses as much as digits as its factorization.

1218215055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81214345.

The product of its (nonzero) digits is 4000, while the sum is 30.

The square root of 1218215055 is about 34902.9376270823. The cubic root of 1218215055 is about 1068.0083646541.

The spelling of 1218215055 in words is "one billion, two hundred eighteen million, two hundred fifteen thousand, fifty-five".