53123218 has 4 divisors (see below), whose sum is σ = 79684830. Its totient is φ = 26561608.

The previous prime is 53123197. The next prime is 53123219. The reversal of 53123218 is 81232135.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81232135 = 5 ⋅16246427.

It can be written as a sum of positive squares in only one way, i.e., 31843449 + 21279769 = 5643^2 + 4613^2 .

It is a junction number, because it is equal to n+sod(n) for n = 53123192 and 53123201.

It is not an unprimeable number, because it can be changed into a prime (53123219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13280803 + ... + 13280806.

Almost surely, 2^53123218 is an apocalyptic number.

53123218 is a deficient number, since it is larger than the sum of its proper divisors (26561612).

53123218 is a wasteful number, since it uses less digits than its factorization.

53123218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26561611.

The product of its digits is 1440, while the sum is 25.

The square root of 53123218 is about 7288.5676233400. The cubic root of 53123218 is about 375.9194457356.

The spelling of 53123218 in words is "fifty-three million, one hundred twenty-three thousand, two hundred eighteen".