1218045205 has 32 divisors (see below), whose sum is σ = 1616630400. Its totient is φ = 875447040.

The previous prime is 1218045203. The next prime is 1218045229. The reversal of 1218045205 is 5025408121.

It is not a de Polignac number, because 1218045205 - 2¹ = 1218045203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218045203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 449946 + ... + 452644.

It is an arithmetic number, because the mean of its divisors is an integer number (50519700).

Almost surely, 2^1218045205 is an apocalyptic number.

It is an amenable number.

1218045205 is a deficient number, since it is larger than the sum of its proper divisors (398585195).

1218045205 is a wasteful number, since it uses less digits than its factorization.

1218045205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2901.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 1218045205 is about 34900.5043659830. The cubic root of 1218045205 is about 1067.9587265515.

The spelling of 1218045205 in words is "one billion, two hundred eighteen million, forty-five thousand, two hundred five".