1218152409 has 16 divisors (see below), whose sum is σ = 1705021440. Its totient is φ = 772580880.

The previous prime is 1218152407. The next prime is 1218152417. The reversal of 1218152409 is 9042518121.

It is not a de Polignac number, because 1218152409 - 2¹ = 1218152407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1218152409.

It is not an unprimeable number, because it can be changed into a prime (1218152407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105517 + ... + 116490.

It is an arithmetic number, because the mean of its divisors is an integer number (106563840).

Almost surely, 2^1218152409 is an apocalyptic number.

It is an amenable number.

1218152409 is a deficient number, since it is larger than the sum of its proper divisors (486869031).

1218152409 is a wasteful number, since it uses less digits than its factorization.

1218152409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222100.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 1218152409 is about 34902.0401839205. The cubic root of 1218152409 is about 1067.9900571042.

The spelling of 1218152409 in words is "one billion, two hundred eighteen million, one hundred fifty-two thousand, four hundred nine".