131801 has 4 divisors (see below), whose sum is σ = 139572. Its totient is φ = 124032.

The previous prime is 131797. The next prime is 131837. The reversal of 131801 is 108131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121801 + 10000 = 349^2 + 100^2 .

It is not a de Polignac number, because 131801 - 2² = 131797 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3860 + ... + 3893.

It is an arithmetic number, because the mean of its divisors is an integer number (34893).

2¹³¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

131801 is a deficient number, since it is larger than the sum of its proper divisors (7771).

131801 is an equidigital number, since it uses as much as digits as its factorization.

131801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 131801 is about 363.0440744593. The cubic root of 131801 is about 50.8908340341.

Adding to 131801 its reverse (108131), we get a palindrome (239932).

The spelling of 131801 in words is "one hundred thirty-one thousand, eight hundred one".