218145023 has 4 divisors (see below), whose sum is σ = 229626360. Its totient is φ = 206663688.

The previous prime is 218145017. The next prime is 218145029. The reversal of 218145023 is 320541812.

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

It is an interprime number because it is at equal distance from previous prime (218145017) and next prime (218145029).

It is a cyclic number.

It is not a de Polignac number, because 218145023 - 2⁶ = 218144959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218144983 and 218145001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218145029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5740640 + ... + 5740677.

It is an arithmetic number, because the mean of its divisors is an integer number (57406590).

Almost surely, 2^218145023 is an apocalyptic number.

218145023 is a deficient number, since it is larger than the sum of its proper divisors (11481337).

218145023 is a wasteful number, since it uses less digits than its factorization.

218145023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11481336.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 218145023 is about 14769.7333422103. The cubic root of 218145023 is about 601.9795939044.

Adding to 218145023 its reverse (320541812), we get a palindrome (538686835).

The spelling of 218145023 in words is "two hundred eighteen million, one hundred forty-five thousand, twenty-three".