1218236361 has 8 divisors (see below), whose sum is σ = 1642566240. Its totient is φ = 803032032.

The previous prime is 1218236347. The next prime is 1218236387. The reversal of 1218236361 is 1636328121.

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

It is not a de Polignac number, because 1218236361 - 2⁵ = 1218236329 is a prime.

It is a super-3 number, since 3×1218236361³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1218236161) 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, 2281075 + ... + 2281608.

It is an arithmetic number, because the mean of its divisors is an integer number (205320780).

Almost surely, 2^1218236361 is an apocalyptic number.

It is an amenable number.

1218236361 is a deficient number, since it is larger than the sum of its proper divisors (424329879).

1218236361 is an equidigital number, since it uses as much as digits as its factorization.

1218236361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4562775.

The product of its digits is 10368, while the sum is 33.

The square root of 1218236361 is about 34903.2428436098. The cubic root of 1218236361 is about 1068.0145909367.

The spelling of 1218236361 in words is "one billion, two hundred eighteen million, two hundred thirty-six thousand, three hundred sixty-one".