218125393 has 4 divisors (see below), whose sum is σ = 225161728. Its totient is φ = 211089060.

The previous prime is 218125381. The next prime is 218125403. The reversal of 218125393 is 393521812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218125393 - 2¹³ = 218117201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218125343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518121 + ... + 3518182.

It is an arithmetic number, because the mean of its divisors is an integer number (56290432).

Almost surely, 2^218125393 is an apocalyptic number.

It is an amenable number.

218125393 is a deficient number, since it is larger than the sum of its proper divisors (7036335).

218125393 is an equidigital number, since it uses as much as digits as its factorization.

218125393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036334.

The product of its digits is 12960, while the sum is 34.

The square root of 218125393 is about 14769.0687925813. The cubic root of 218125393 is about 601.9615367824.

The spelling of 218125393 in words is "two hundred eighteen million, one hundred twenty-five thousand, three hundred ninety-three".