218819071 has 4 divisors (see below), whose sum is σ = 220943632. Its totient is φ = 216694512.

The previous prime is 218819057. The next prime is 218819137. The reversal of 218819071 is 170918812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 218819071 - 2¹⁷ = 218687999 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 218819071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218819011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1062126 + ... + 1062331.

It is an arithmetic number, because the mean of its divisors is an integer number (55235908).

Almost surely, 2^218819071 is an apocalyptic number.

218819071 is a deficient number, since it is larger than the sum of its proper divisors (2124561).

218819071 is a wasteful number, since it uses less digits than its factorization.

218819071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124560.

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 218819071 is about 14792.5342994363. The cubic root of 218819071 is about 602.5989768698.

The spelling of 218819071 in words is "two hundred eighteen million, eight hundred nineteen thousand, seventy-one".