131551 has 4 divisors (see below), whose sum is σ = 150352. Its totient is φ = 112752.

The previous prime is 131543. The next prime is 131561. The reversal of 131551 is 155131.

131551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155131 = 53 ⋅2927.

It is a cyclic number.

It is not a de Polignac number, because 131551 - 2³ = 131543 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9390 + ... + 9403.

It is an arithmetic number, because the mean of its divisors is an integer number (37588).

2¹³¹⁵⁵¹ is an apocalyptic number.

131551 is a deficient number, since it is larger than the sum of its proper divisors (18801).

131551 is an equidigital number, since it uses as much as digits as its factorization.

131551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18800.

The product of its digits is 75, while the sum is 16.

The square root of 131551 is about 362.6996002203. The cubic root of 131551 is about 50.8586371081.

Adding to 131551 its reverse (155131), we get a palindrome (286682).

The spelling of 131551 in words is "one hundred thirty-one thousand, five hundred fifty-one".