181423085 has 4 divisors (see below), whose sum is σ = 217707708. Its totient is φ = 145138464.

The previous prime is 181423037. The next prime is 181423091. The reversal of 181423085 is 580324181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21501769 + 159921316 = 4637^2 + 12646^2 .

It is a cyclic number.

It is not a de Polignac number, because 181423085 - 2¹² = 181418989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18142304 + ... + 18142313.

It is an arithmetic number, because the mean of its divisors is an integer number (54426927).

Almost surely, 2^181423085 is an apocalyptic number.

It is an amenable number.

181423085 is a deficient number, since it is larger than the sum of its proper divisors (36284623).

181423085 is an equidigital number, since it uses as much as digits as its factorization.

181423085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36284622.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 181423085 is about 13469.3386994314. The cubic root of 181423085 is about 566.1056845442.

The spelling of 181423085 in words is "one hundred eighty-one million, four hundred twenty-three thousand, eighty-five".