131863 has 4 divisors (see below), whose sum is σ = 136440. Its totient is φ = 127288.

The previous prime is 131861. The next prime is 131891. The reversal of 131863 is 368131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368131 = 547 ⋅673.

It is a cyclic number.

It is not a de Polignac number, because 131863 - 2¹ = 131861 is a prime.

It is a Duffinian number.

It is a congruent 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, 2245 + ... + 2302.

It is an arithmetic number, because the mean of its divisors is an integer number (34110).

2¹³¹⁸⁶³ is an apocalyptic number.

131863 is a deficient number, since it is larger than the sum of its proper divisors (4577).

131863 is an equidigital number, since it uses as much as digits as its factorization.

131863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4576.

The product of its digits is 432, while the sum is 22.

The square root of 131863 is about 363.1294535011. The cubic root of 131863 is about 50.8988125702.

Subtracting from 131863 its sum of digits (22), we obtain a triangular number (131841 = T₅₁₃).

Adding to 131863 its reverse (368131), we get a palindrome (499994).

The spelling of 131863 in words is "one hundred thirty-one thousand, eight hundred sixty-three".