218150987 has 4 divisors (see below), whose sum is σ = 230983416. Its totient is φ = 205318560.

The previous prime is 218150983. The next prime is 218150993. The reversal of 218150987 is 789051812.

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

It is a cyclic number.

It is not a de Polignac number, because 218150987 - 2² = 218150983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218150981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6416189 + ... + 6416222.

It is an arithmetic number, because the mean of its divisors is an integer number (57745854).

Almost surely, 2^218150987 is an apocalyptic number.

218150987 is a deficient number, since it is larger than the sum of its proper divisors (12832429).

218150987 is a wasteful number, since it uses less digits than its factorization.

218150987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12832428.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 218150987 is about 14769.9352402101. The cubic root of 218150987 is about 601.9850798170.

The spelling of 218150987 in words is "two hundred eighteen million, one hundred fifty thousand, nine hundred eighty-seven".