218942965 has 4 divisors (see below), whose sum is σ = 262731564. Its totient is φ = 175154368.

The previous prime is 218942951. The next prime is 218942981. The reversal of 218942965 is 569249812.

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 92582884 + 126360081 = 9622^2 + 11241^2 .

It is a cyclic number.

It is not a de Polignac number, because 218942965 - 2¹⁷ = 218811893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21894292 + ... + 21894301.

It is an arithmetic number, because the mean of its divisors is an integer number (65682891).

Almost surely, 2^218942965 is an apocalyptic number.

It is an amenable number.

218942965 is a deficient number, since it is larger than the sum of its proper divisors (43788599).

218942965 is an equidigital number, since it uses as much as digits as its factorization.

218942965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43788598.

The product of its digits is 311040, while the sum is 46.

The square root of 218942965 is about 14796.7214273974. The cubic root of 218942965 is about 602.7126846792.

It can be divided in two parts, 2189 and 42965, that added together give a palindrome (45154).

The spelling of 218942965 in words is "two hundred eighteen million, nine hundred forty-two thousand, nine hundred sixty-five".