218350906 has 4 divisors (see below), whose sum is σ = 327526362. Its totient is φ = 109175452.

The previous prime is 218350901. The next prime is 218350919. The reversal of 218350906 is 609053812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 157276681 + 61074225 = 12541^2 + 7815^2 .

It is a super-3 number, since 3×218350906³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (218350901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54587725 + ... + 54587728.

Almost surely, 2^218350906 is an apocalyptic number.

218350906 is a deficient number, since it is larger than the sum of its proper divisors (109175456).

218350906 is a wasteful number, since it uses less digits than its factorization.

218350906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109175455.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 218350906 is about 14776.7014587153. The cubic root of 218350906 is about 602.1689150468.

The spelling of 218350906 in words is "two hundred eighteen million, three hundred fifty thousand, nine hundred six".