218972265 has 16 divisors (see below), whose sum is σ = 350889408. Its totient is φ = 116607296.

The previous prime is 218972239. The next prime is 218972269. The reversal of 218972265 is 562279812.

It is a cyclic number.

It is not a de Polignac number, because 218972265 - 2⁸ = 218972009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218972269) 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 15 ways as a sum of consecutive naturals, for example, 627 + ... + 20936.

It is an arithmetic number, because the mean of its divisors is an integer number (21930588).

Almost surely, 2^218972265 is an apocalyptic number.

It is an amenable number.

218972265 is a deficient number, since it is larger than the sum of its proper divisors (131917143).

218972265 is a wasteful number, since it uses less digits than its factorization.

218972265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22248.

The product of its digits is 120960, while the sum is 42.

The square root of 218972265 is about 14797.7114784686. The cubic root of 218972265 is about 602.7395694495.

The spelling of 218972265 in words is "two hundred eighteen million, nine hundred seventy-two thousand, two hundred sixty-five".