218124901 has 8 divisors (see below), whose sum is σ = 219863160. Its totient is φ = 216393408.

The previous prime is 218124899. The next prime is 218124937. The reversal of 218124901 is 109421812.

It can be written as a sum of positive squares in 4 ways, for example, as 126540001 + 91584900 = 11249^2 + 9570^2 .

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 218124901 - 2¹ = 218124899 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 218124901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218124941) 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, 76815 + ... + 79603.

It is an arithmetic number, because the mean of its divisors is an integer number (27482895).

Almost surely, 2^218124901 is an apocalyptic number.

It is an amenable number.

218124901 is a deficient number, since it is larger than the sum of its proper divisors (1738259).

218124901 is a wasteful number, since it uses less digits than its factorization.

218124901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 218124901 is about 14769.0521361393. The cubic root of 218124901 is about 601.9610841906.

The spelling of 218124901 in words is "two hundred eighteen million, one hundred twenty-four thousand, nine hundred one".