181522 has 16 divisors (see below), whose sum is σ = 306432. Its totient is φ = 79920.

The previous prime is 181513. The next prime is 181523. The reversal of 181522 is 225181.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 181522.

It is not an unprimeable number, because it can be changed into a prime (181523) by changing a digit.

181522 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703 + ... + 925.

It is an arithmetic number, because the mean of its divisors is an integer number (19152).

2¹⁸¹⁵²² is an apocalyptic number.

181522 is a deficient number, since it is larger than the sum of its proper divisors (124910).

181522 is a wasteful number, since it uses less digits than its factorization.

181522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273.

The product of its digits is 160, while the sum is 19.

The square root of 181522 is about 426.0539871894. The cubic root of 181522 is about 56.6208549385.

Subtracting from 181522 its sum of digits (19), we obtain a triangular number (181503 = T₆₀₂).

It can be divided in two parts, 181 and 522, that added together give a triangular number (703 = T₃₇).

The spelling of 181522 in words is "one hundred eighty-one thousand, five hundred twenty-two".