131605985 has 8 divisors (see below), whose sum is σ = 180488256. Its totient is φ = 90244080.

The previous prime is 131605979. The next prime is 131606009. The reversal of 131605985 is 589506131.

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

It is not a de Polignac number, because 131605985 - 2¹⁶ = 131540449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1880051 + ... + 1880120.

It is an arithmetic number, because the mean of its divisors is an integer number (22561032).

Almost surely, 2^131605985 is an apocalyptic number.

It is an amenable number.

131605985 is a deficient number, since it is larger than the sum of its proper divisors (48882271).

131605985 is an equidigital number, since it uses as much as digits as its factorization.

131605985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760183.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 131605985 is about 11471.9651760280. The cubic root of 131605985 is about 508.6572199693.

The spelling of 131605985 in words is "one hundred thirty-one million, six hundred five thousand, nine hundred eighty-five".