218564013 has 8 divisors (see below), whose sum is σ = 292449568. Its totient is φ = 145193904.

The previous prime is 218563993. The next prime is 218564033. The reversal of 218564013 is 310465812.

It is an interprime number because it is at equal distance from previous prime (218563993) and next prime (218564033).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218564013 - 2⁶ = 218563949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218564033) 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 7 ways as a sum of consecutive naturals, for example, 127870 + ... + 129567.

It is an arithmetic number, because the mean of its divisors is an integer number (36556196).

Almost surely, 2^218564013 is an apocalyptic number.

It is an amenable number.

218564013 is a deficient number, since it is larger than the sum of its proper divisors (73885555).

218564013 is a wasteful number, since it uses less digits than its factorization.

218564013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257723.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 218564013 is about 14783.9106125544. The cubic root of 218564013 is about 602.3647537662.

The spelling of 218564013 in words is "two hundred eighteen million, five hundred sixty-four thousand, thirteen".