181997085 has 8 divisors (see below), whose sum is σ = 291195360. Its totient is φ = 97065104.

The previous prime is 181997083. The next prime is 181997089. The reversal of 181997085 is 580799181.

181997085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 181997085 - 2¹ = 181997083 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181997083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6066555 + ... + 6066584.

It is an arithmetic number, because the mean of its divisors is an integer number (36399420).

Almost surely, 2^181997085 is an apocalyptic number.

181997085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181997085 is a deficient number, since it is larger than the sum of its proper divisors (109198275).

181997085 is a wasteful number, since it uses less digits than its factorization.

181997085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12133147.

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 181997085 is about 13490.6295257115. The cubic root of 181997085 is about 566.7020852525.

The spelling of 181997085 in words is "one hundred eighty-one million, nine hundred ninety-seven thousand, eighty-five".