131438 has 4 divisors (see below), whose sum is σ = 197160. Its totient is φ = 65718.

The previous prime is 131437. The next prime is 131441. The reversal of 131438 is 834131.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131431) 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 as a sum of consecutive naturals, namely, 32858 + ... + 32861.

It is an arithmetic number, because the mean of its divisors is an integer number (49290).

2¹³¹⁴³⁸ is an apocalyptic number.

131438 is a deficient number, since it is larger than the sum of its proper divisors (65722).

131438 is an equidigital number, since it uses as much as digits as its factorization.

131438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65721.

The product of its digits is 288, while the sum is 20.

The square root of 131438 is about 362.5437904585. The cubic root of 131438 is about 50.8440707110.

Adding to 131438 its reverse (834131), we get a palindrome (965569).

The spelling of 131438 in words is "one hundred thirty-one thousand, four hundred thirty-eight".