1218561204 has 36 divisors (see below), whose sum is σ = 3307524864. Its totient is φ = 348160176.

The previous prime is 1218561203. The next prime is 1218561217. The reversal of 1218561204 is 4021658121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218561203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1035604 + ... + 1036779.

Almost surely, 2^1218561204 is an apocalyptic number.

1218561204 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1218561204 is an abundant number, since it is smaller than the sum of its proper divisors (2088963660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218561204 is a wasteful number, since it uses less digits than its factorization.

1218561204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072404 (or 2072395 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1218561204 is about 34907.8960122205. The cubic root of 1218561204 is about 1068.1095112775.

The spelling of 1218561204 in words is "one billion, two hundred eighteen million, five hundred sixty-one thousand, two hundred four".