218022461 has 8 divisors (see below), whose sum is σ = 224482104. Its totient is φ = 211617280.

The previous prime is 218022449. The next prime is 218022557. The reversal of 218022461 is 164220812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4687225 + 213335236 = 2165^2 + 14606^2 .

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 218022461 - 2¹⁸ = 217760317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 218022461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218022661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5420 + ... + 21573.

It is an arithmetic number, because the mean of its divisors is an integer number (28060263).

Almost surely, 2^218022461 is an apocalyptic number.

It is an amenable number.

218022461 is a deficient number, since it is larger than the sum of its proper divisors (6459643).

218022461 is a wasteful number, since it uses less digits than its factorization.

218022461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27231.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 218022461 is about 14765.5836660797. The cubic root of 218022461 is about 601.8668345976.

The spelling of 218022461 in words is "two hundred eighteen million, twenty-two thousand, four hundred sixty-one".