218595061 has 4 divisors (see below), whose sum is σ = 231453612. Its totient is φ = 205736512.

The previous prime is 218595037. The next prime is 218595089. The reversal of 218595061 is 160595812.

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

It can be written as a sum of positive squares in 2 ways, for example, as 59582961 + 159012100 = 7719^2 + 12610^2 .

It is a cyclic number.

It is not a de Polignac number, because 218595061 - 2¹³ = 218586869 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 218595061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218590061) 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, 6429250 + ... + 6429283.

It is an arithmetic number, because the mean of its divisors is an integer number (57863403).

Almost surely, 2^218595061 is an apocalyptic number.

It is an amenable number.

218595061 is a deficient number, since it is larger than the sum of its proper divisors (12858551).

218595061 is a wasteful number, since it uses less digits than its factorization.

218595061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12858550.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 218595061 is about 14784.9606357271. The cubic root of 218595061 is about 602.3932752889.

The spelling of 218595061 in words is "two hundred eighteen million, five hundred ninety-five thousand, sixty-one".