131999 has 8 divisors (see below), whose sum is σ = 153120. Its totient is φ = 111456.

The previous prime is 131969. The next prime is 132001. The reversal of 131999 is 999131.

131999 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 131999 - 2⁸ = 131743 is a prime.

It is a Duffinian number.

131999 is a modest number, since divided by 999 gives 131 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131909) 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, 677 + ... + 849.

It is an arithmetic number, because the mean of its divisors is an integer number (19140).

2¹³¹⁹⁹⁹ is an apocalyptic number.

131999 is a deficient number, since it is larger than the sum of its proper divisors (21121).

131999 is a wasteful number, since it uses less digits than its factorization.

131999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289.

The product of its digits is 2187, while the sum is 32.

The square root of 131999 is about 363.3166662844. The cubic root of 131999 is about 50.9163051194.

The spelling of 131999 in words is "one hundred thirty-one thousand, nine hundred ninety-nine".