181145806 has 4 divisors (see below), whose sum is σ = 271718712. Its totient is φ = 90572902.

The previous prime is 181145759. The next prime is 181145843. The reversal of 181145806 is 608541181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 608541181 = 149 ⋅4084169.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45286450 + ... + 45286453.

It is an arithmetic number, because the mean of its divisors is an integer number (67929678).

Almost surely, 2^181145806 is an apocalyptic number.

181145806 is a deficient number, since it is larger than the sum of its proper divisors (90572906).

181145806 is an equidigital number, since it uses as much as digits as its factorization.

181145806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90572905.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 181145806 is about 13459.0417935305. The cubic root of 181145806 is about 565.8171338812.

Adding to 181145806 its reverse (608541181), we get a palindrome (789686987).

The spelling of 181145806 in words is "one hundred eighty-one million, one hundred forty-five thousand, eight hundred six".