180813 has 4 divisors (see below), whose sum is σ = 241088. Its totient is φ = 120540.

The previous prime is 180811. The next prime is 180847. The reversal of 180813 is 318081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 180813 - 2¹ = 180811 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 180813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30133 + ... + 30138.

It is an arithmetic number, because the mean of its divisors is an integer number (60272).

2¹⁸⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

180813 is a deficient number, since it is larger than the sum of its proper divisors (60275).

180813 is an equidigital number, since it uses as much as digits as its factorization.

180813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60274.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 180813 is about 425.2211189487. The cubic root of 180813 is about 56.5470409917.

Adding to 180813 its reverse (318081), we get a palindrome (498894).

The spelling of 180813 in words is "one hundred eighty thousand, eight hundred thirteen".