131599 has 8 divisors (see below), whose sum is σ = 145152. Its totient is φ = 118560.

The previous prime is 131591. The next prime is 131611. The reversal of 131599 is 995131.

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

It is not a de Polignac number, because 131599 - 2³ = 131591 is a prime.

It is a Duffinian number.

131599 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131591) 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, 594 + ... + 784.

It is an arithmetic number, because the mean of its divisors is an integer number (18144).

2¹³¹⁵⁹⁹ is an apocalyptic number.

131599 is a deficient number, since it is larger than the sum of its proper divisors (13553).

131599 is a wasteful number, since it uses less digits than its factorization.

131599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257.

The product of its digits is 1215, while the sum is 28.

The square root of 131599 is about 362.7657646471. The cubic root of 131599 is about 50.8648220800.

The spelling of 131599 in words is "one hundred thirty-one thousand, five hundred ninety-nine".