218148909 has 8 divisors (see below), whose sum is σ = 317307552. Its totient is φ = 132211440.

The previous prime is 218148907. The next prime is 218148967. The reversal of 218148909 is 909841812.

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

It is not a de Polignac number, because 218148909 - 2¹ = 218148907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218148907) 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, 3305254 + ... + 3305319.

It is an arithmetic number, because the mean of its divisors is an integer number (39663444).

Almost surely, 2^218148909 is an apocalyptic number.

It is an amenable number.

218148909 is a deficient number, since it is larger than the sum of its proper divisors (99158643).

218148909 is a wasteful number, since it uses less digits than its factorization.

218148909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6610587.

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 218148909 is about 14769.8648944396. The cubic root of 218148909 is about 601.9831684054.

The spelling of 218148909 in words is "two hundred eighteen million, one hundred forty-eight thousand, nine hundred nine".