180811813 has 48 divisors (see below), whose sum is σ = 244762560. Its totient is φ = 131894784.

The previous prime is 180811801. The next prime is 180811819. The reversal of 180811813 is 318118081.

180811813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-180811813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180811819) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 638770 + ... + 639052.

It is an arithmetic number, because the mean of its divisors is an integer number (5099220).

Almost surely, 2^180811813 is an apocalyptic number.

180811813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

180811813 is a deficient number, since it is larger than the sum of its proper divisors (63950747).

180811813 is a wasteful number, since it uses less digits than its factorization.

180811813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 31.

The square root of 180811813 is about 13446.6283134472. The cubic root of 180811813 is about 565.4691725152.

Adding to 180811813 its reverse (318118081), we get a palindrome (498929894).

The spelling of 180811813 in words is "one hundred eighty million, eight hundred eleven thousand, eight hundred thirteen".