131819 has 4 divisors (see below), whose sum is σ = 132696. Its totient is φ = 130944.

The previous prime is 131797. The next prime is 131837. The reversal of 131819 is 918131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131819 is a prime.

It is a super-2 number, since 2×131819² = 34752497522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 131794 and 131803.

It is not an unprimeable number, because it can be changed into a prime (131839) 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, 149 + ... + 534.

It is an arithmetic number, because the mean of its divisors is an integer number (33174).

2¹³¹⁸¹⁹ is an apocalyptic number.

131819 is a deficient number, since it is larger than the sum of its proper divisors (877).

131819 is an equidigital number, since it uses as much as digits as its factorization.

131819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its digits is 216, while the sum is 23.

The square root of 131819 is about 363.0688639914. The cubic root of 131819 is about 50.8931506410.

The spelling of 131819 in words is "one hundred thirty-one thousand, eight hundred nineteen".