180109385 has 4 divisors (see below), whose sum is σ = 216131268. Its totient is φ = 144087504.

The previous prime is 180109283. The next prime is 180109399. The reversal of 180109385 is 583901081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583901081 = 349 ⋅1673069.

It can be written as a sum of positive squares in 2 ways, for example, as 118831801 + 61277584 = 10901^2 + 7828^2 .

It is a cyclic number.

It is not a de Polignac number, because 180109385 - 2²² = 175915081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18010934 + ... + 18010943.

It is an arithmetic number, because the mean of its divisors is an integer number (54032817).

Almost surely, 2^180109385 is an apocalyptic number.

It is an amenable number.

180109385 is a deficient number, since it is larger than the sum of its proper divisors (36021883).

180109385 is an equidigital number, since it uses as much as digits as its factorization.

180109385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36021882.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 180109385 is about 13420.4837841264. The cubic root of 180109385 is about 564.7359666420.

The spelling of 180109385 in words is "one hundred eighty million, one hundred nine thousand, three hundred eighty-five".