218791013 has 8 divisors (see below), whose sum is σ = 252341760. Its totient is φ = 185814000.

The previous prime is 218791007. The next prime is 218791021. The reversal of 218791013 is 310197812.

218791013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 218791013 - 2¹⁴ = 218774629 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 (218791033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142613 + ... + 144138.

It is an arithmetic number, because the mean of its divisors is an integer number (31542720).

Almost surely, 2^218791013 is an apocalyptic number.

It is an amenable number.

218791013 is a deficient number, since it is larger than the sum of its proper divisors (33550747).

218791013 is a wasteful number, since it uses less digits than its factorization.

218791013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286867.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 218791013 is about 14791.5858852254. The cubic root of 218791013 is about 602.5732197534.

The spelling of 218791013 in words is "two hundred eighteen million, seven hundred ninety-one thousand, thirteen".