818522 has 4 divisors (see below), whose sum is σ = 1227786. Its totient is φ = 409260.

The previous prime is 818509. The next prime is 818561. The reversal of 818522 is 225818.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 225818 = 2 ⋅112909.

It can be written as a sum of positive squares in only one way, i.e., 657721 + 160801 = 811^2 + 401^2 .

It is a junction number, because it is equal to n+sod(n) for n = 818491 and 818500.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 818522.

It is an unprimeable number.

818522 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204629 + ... + 204632.

2⁸¹⁸⁵²² is an apocalyptic number.

818522 is a deficient number, since it is larger than the sum of its proper divisors (409264).

818522 is a wasteful number, since it uses less digits than its factorization.

818522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409263.

The product of its digits is 1280, while the sum is 26.

The square root of 818522 is about 904.7220567666. The cubic root of 818522 is about 93.5427469040.

Subtracting from 818522 its reverse (225818), we obtain a cube (592704 = 84³).

The spelling of 818522 in words is "eight hundred eighteen thousand, five hundred twenty-two".