131555 has 8 divisors (see below), whose sum is σ = 160272. Its totient is φ = 103648.

The previous prime is 131543. The next prime is 131561. The reversal of 131555 is 555131.

It is a happy number.

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 131555 - 2¹⁰ = 130531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 257 + ... + 573.

It is an arithmetic number, because the mean of its divisors is an integer number (20034).

2¹³¹⁵⁵⁵ is an apocalyptic number.

131555 is a deficient number, since it is larger than the sum of its proper divisors (28717).

131555 is an equidigital number, since it uses as much as digits as its factorization.

131555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405.

The product of its digits is 375, while the sum is 20.

The square root of 131555 is about 362.7051143836. The cubic root of 131555 is about 50.8591525799.

Adding to 131555 its reverse (555131), we get a palindrome (686686).

It can be divided in two parts, 131 and 555, that added together give a palindrome (686).

The spelling of 131555 in words is "one hundred thirty-one thousand, five hundred fifty-five".