181413813 has 16 divisors (see below), whose sum is σ = 276832256. Its totient is φ = 103518000.

The previous prime is 181413809. The next prime is 181413913. The reversal of 181413813 is 318314181.

181413813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 181413813 - 2² = 181413809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181413803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10020 + ... + 21522.

It is an arithmetic number, because the mean of its divisors is an integer number (17302016).

Almost surely, 2^181413813 is an apocalyptic number.

It is an amenable number.

181413813 is a deficient number, since it is larger than the sum of its proper divisors (95418443).

181413813 is a wasteful number, since it uses less digits than its factorization.

181413813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12264.

The product of its digits is 2304, while the sum is 30.

The square root of 181413813 is about 13468.9945059013. The cubic root of 181413813 is about 566.0960403813.

Adding to 181413813 its reverse (318314181), we get a palindrome (499727994).

The spelling of 181413813 in words is "one hundred eighty-one million, four hundred thirteen thousand, eight hundred thirteen".