131405 has 8 divisors (see below), whose sum is σ = 161784. Its totient is φ = 102400.

The previous prime is 131381. The next prime is 131413. The reversal of 131405 is 504131.

It can be written as a sum of positive squares in 4 ways, for example, as 9604 + 121801 = 98^2 + 349^2 .

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

It is not a de Polignac number, because 131405 - 2⁸ = 131149 is a prime.

It is an Ulam number.

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 131405.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 131405.

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, 116 + ... + 525.

It is an arithmetic number, because the mean of its divisors is an integer number (20223).

2¹³¹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

131405 is a deficient number, since it is larger than the sum of its proper divisors (30379).

131405 is an equidigital number, since it uses as much as digits as its factorization.

131405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 131405 is about 362.4982758580. The cubic root of 131405 is about 50.8398152324.

Adding to 131405 its reverse (504131), we get a palindrome (635536).

The spelling of 131405 in words is "one hundred thirty-one thousand, four hundred five".