218964457 has 4 divisors (see below), whose sum is σ = 218994516. Its totient is φ = 218934400.

The previous prime is 218964443. The next prime is 218964461. The reversal of 218964457 is 754469812.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 51494976 + 167469481 = 7176^2 + 12941^2 .

It is a cyclic number.

It is not a de Polignac number, because 218964457 - 2¹¹ = 218962409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218964407) 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 3 ways as a sum of consecutive naturals, for example, 3573 + ... + 21229.

It is an arithmetic number, because the mean of its divisors is an integer number (54748629).

Almost surely, 2^218964457 is an apocalyptic number.

It is an amenable number.

218964457 is a deficient number, since it is larger than the sum of its proper divisors (30059).

218964457 is a wasteful number, since it uses less digits than its factorization.

218964457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30058.

The product of its digits is 483840, while the sum is 46.

The square root of 218964457 is about 14797.4476515377. The cubic root of 218964457 is about 602.7324053056.

The spelling of 218964457 in words is "two hundred eighteen million, nine hundred sixty-four thousand, four hundred fifty-seven".