218793901 has 2 divisors, whose sum is σ = 218793902. Its totient is φ = 218793900.

The previous prime is 218793899. The next prime is 218793929. The reversal of 218793901 is 109397812.

218793901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208224900 + 10569001 = 14430^2 + 3251^2 .

It is a cyclic number.

It is not a de Polignac number, because 218793901 - 2¹ = 218793899 is a prime.

It is a super-2 number, since 2×218793901² = 95741542229595602, which contains 22 as substring.

Together with 218793899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218793101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109396950 + 109396951.

It is an arithmetic number, because the mean of its divisors is an integer number (109396951).

Almost surely, 2^218793901 is an apocalyptic number.

It is an amenable number.

218793901 is a deficient number, since it is larger than the sum of its proper divisors (1).

218793901 is an equidigital number, since it uses as much as digits as its factorization.

218793901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 218793901 is about 14791.6835079716. The cubic root of 218793901 is about 602.5758710260.

The spelling of 218793901 in words is "two hundred eighteen million, seven hundred ninety-three thousand, nine hundred one".