218148905 has 32 divisors (see below), whose sum is σ = 301432320. Its totient is φ = 150289920.

The previous prime is 218148883. The next prime is 218148907. The reversal of 218148905 is 509841812.

It is not a de Polignac number, because 218148905 - 2⁸ = 218148649 is a prime.

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 59516 + ... + 63074.

It is an arithmetic number, because the mean of its divisors is an integer number (9419760).

Almost surely, 2^218148905 is an apocalyptic number.

It is an amenable number.

218148905 is a deficient number, since it is larger than the sum of its proper divisors (83283415).

218148905 is a wasteful number, since it uses less digits than its factorization.

218148905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3641.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 218148905 is about 14769.8647590288. The cubic root of 218148905 is about 601.9831647260.

The spelling of 218148905 in words is "two hundred eighteen million, one hundred forty-eight thousand, nine hundred five".