218540254 has 4 divisors (see below), whose sum is σ = 327810384. Its totient is φ = 109270126.

The previous prime is 218540251. The next prime is 218540279. The reversal of 218540254 is 452045812.

218540254 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218540251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54635062 + ... + 54635065.

It is an arithmetic number, because the mean of its divisors is an integer number (81952596).

Almost surely, 2^218540254 is an apocalyptic number.

218540254 is a deficient number, since it is larger than the sum of its proper divisors (109270130).

218540254 is a wasteful number, since it uses less digits than its factorization.

218540254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109270129.

The product of its (nonzero) digits is 12800, while the sum is 31.

The square root of 218540254 is about 14783.1070482494. The cubic root of 218540254 is about 602.3429262893.

The spelling of 218540254 in words is "two hundred eighteen million, five hundred forty thousand, two hundred fifty-four".