1218159090 has 24 divisors (see below), whose sum is σ = 3167213868. Its totient is φ = 324842400.

The previous prime is 1218159079. The next prime is 1218159091. The reversal of 1218159090 is 909518121.

It can be written as a sum of positive squares in 2 ways, for example, as 1085241249 + 132917841 = 32943^2 + 11529^2 .

It is not an unprimeable number, because it can be changed into a prime (1218159091) 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, 6767461 + ... + 6767640.

Almost surely, 2^1218159090 is an apocalyptic number.

1218159090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1218159090 is an abundant number, since it is smaller than the sum of its proper divisors (1949054778).

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

1218159090 is a wasteful number, since it uses less digits than its factorization.

1218159090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13535114 (or 13535111 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 1218159090 is about 34902.1358945266. The cubic root of 1218159090 is about 1067.9920095770.

The spelling of 1218159090 in words is "one billion, two hundred eighteen million, one hundred fifty-nine thousand, ninety".