218250947 has 16 divisors (see below), whose sum is σ = 237650112. Its totient is φ = 199664640.

The previous prime is 218250937. The next prime is 218250961. The reversal of 218250947 is 749052812.

It is a cyclic number.

It is not a de Polignac number, because 218250947 - 2¹⁰ = 218249923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218250947.

It is not an unprimeable number, because it can be changed into a prime (218250917) 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 in 15 ways as a sum of consecutive naturals, for example, 86873 + ... + 89349.

It is an arithmetic number, because the mean of its divisors is an integer number (14853132).

Almost surely, 2^218250947 is an apocalyptic number.

218250947 is a deficient number, since it is larger than the sum of its proper divisors (19399165).

218250947 is a wasteful number, since it uses less digits than its factorization.

218250947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 218250947 is about 14773.3187537533. The cubic root of 218250947 is about 602.0770119245.

The spelling of 218250947 in words is "two hundred eighteen million, two hundred fifty thousand, nine hundred forty-seven".