51818223 has 8 divisors (see below), whose sum is σ = 69317248. Its totient is φ = 34432344.

The previous prime is 51818213. The next prime is 51818231. The reversal of 51818223 is 32281815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51818223 - 2¹⁸ = 51556079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51818213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27211 + ... + 29052.

It is an arithmetic number, because the mean of its divisors is an integer number (8664656).

Almost surely, 2^51818223 is an apocalyptic number.

51818223 is a deficient number, since it is larger than the sum of its proper divisors (17499025).

51818223 is a wasteful number, since it uses less digits than its factorization.

51818223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56573.

The product of its digits is 3840, while the sum is 30.

The square root of 51818223 is about 7198.4875494787. The cubic root of 51818223 is about 372.8156818259.

The spelling of 51818223 in words is "fifty-one million, eight hundred eighteen thousand, two hundred twenty-three".