1218315161 has 8 divisors (see below), whose sum is σ = 1405373760. Its totient is φ = 1034509968.

The previous prime is 1218315157. The next prime is 1218315179. The reversal of 1218315161 is 1615138121.

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 1218315161 - 2² = 1218315157 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1218315061) 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 7 ways as a sum of consecutive naturals, for example, 812546 + ... + 814043.

It is an arithmetic number, because the mean of its divisors is an integer number (175671720).

Almost surely, 2^1218315161 is an apocalyptic number.

It is an amenable number.

1218315161 is a deficient number, since it is larger than the sum of its proper divisors (187058599).

1218315161 is a wasteful number, since it uses less digits than its factorization.

1218315161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626703.

The product of its digits is 1440, while the sum is 29.

The square root of 1218315161 is about 34904.3716602949. The cubic root of 1218315161 is about 1068.0376181417.

The spelling of 1218315161 in words is "one billion, two hundred eighteen million, three hundred fifteen thousand, one hundred sixty-one".