218971899 has 12 divisors (see below), whose sum is σ = 316428112. Its totient is φ = 145918800.

The previous prime is 218971897. The next prime is 218971913. The reversal of 218971899 is 998179812.

It is not a de Polignac number, because 218971899 - 2¹ = 218971897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218971897) 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, 28434 + ... + 35304.

Almost surely, 2^218971899 is an apocalyptic number.

218971899 is a deficient number, since it is larger than the sum of its proper divisors (97456213).

218971899 is a wasteful number, since it uses less digits than its factorization.

218971899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10418 (or 10415 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The square root of 218971899 is about 14797.6991116862. The cubic root of 218971899 is about 602.7392336341.

It can be divided in two parts, 2189 and 71899, that added together give a cube (74088 = 42³).

The spelling of 218971899 in words is "two hundred eighteen million, nine hundred seventy-one thousand, eight hundred ninety-nine".