181413809 has 2 divisors, whose sum is σ = 181413810. Its totient is φ = 181413808.

The previous prime is 181413803. The next prime is 181413913. The reversal of 181413809 is 908314181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181306225 + 107584 = 13465^2 + 328^2 .

It is an emirp because it is prime and its reverse (908314181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181413809 - 2¹² = 181409713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181413803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90706904 + 90706905.

It is an arithmetic number, because the mean of its divisors is an integer number (90706905).

Almost surely, 2^181413809 is an apocalyptic number.

It is an amenable number.

181413809 is a deficient number, since it is larger than the sum of its proper divisors (1).

181413809 is an equidigital number, since it uses as much as digits as its factorization.

181413809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 181413809 is about 13468.9943574121. The cubic root of 181413809 is about 566.0960362207.

The spelling of 181413809 in words is "one hundred eighty-one million, four hundred thirteen thousand, eight hundred nine".