180985499 has 4 divisors (see below), whose sum is σ = 181016136. Its totient is φ = 180954864.

The previous prime is 180985481. The next prime is 180985529. The reversal of 180985499 is 994589081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 994589081 = 3793 ⋅262217.

It is a cyclic number.

It is not a de Polignac number, because 180985499 - 2⁸ = 180985243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 180985499.

It is not an unprimeable number, because it can be changed into a prime (180985699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3329 + ... + 19314.

It is an arithmetic number, because the mean of its divisors is an integer number (45254034).

Almost surely, 2^180985499 is an apocalyptic number.

180985499 is a deficient number, since it is larger than the sum of its proper divisors (30637).

180985499 is an equidigital number, since it uses as much as digits as its factorization.

180985499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30636.

The product of its (nonzero) digits is 933120, while the sum is 53.

The square root of 180985499 is about 13453.0851108584. The cubic root of 180985499 is about 565.6501758948.

The spelling of 180985499 in words is "one hundred eighty million, nine hundred eighty-five thousand, four hundred ninety-nine".