181542 has 16 divisors (see below), whose sum is σ = 368640. Its totient is φ = 59592.

The previous prime is 181537. The next prime is 181549. The reversal of 181542 is 245181.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181549) by changing a digit.

181542 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 in 7 ways as a sum of consecutive naturals, for example, 283 + ... + 665.

It is an arithmetic number, because the mean of its divisors is an integer number (23040).

2¹⁸¹⁵⁴² is an apocalyptic number.

181542 is an abundant number, since it is smaller than the sum of its proper divisors (187098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181542 is a wasteful number, since it uses less digits than its factorization.

181542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its digits is 320, while the sum is 21.

The square root of 181542 is about 426.0774577468. The cubic root of 181542 is about 56.6229343476.

The spelling of 181542 in words is "one hundred eighty-one thousand, five hundred forty-two".