131338321 has 4 divisors (see below), whose sum is σ = 131392512. Its totient is φ = 131284132.

The previous prime is 131338309. The next prime is 131338331. The reversal of 131338321 is 123833131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123833131 = 191 ⋅648341.

It is a cyclic number.

It is not a de Polignac number, because 131338321 - 2²³ = 122949713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131338301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23281 + ... + 28366.

It is an arithmetic number, because the mean of its divisors is an integer number (32848128).

Almost surely, 2^131338321 is an apocalyptic number.

It is an amenable number.

131338321 is a deficient number, since it is larger than the sum of its proper divisors (54191).

131338321 is an equidigital number, since it uses as much as digits as its factorization.

131338321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54190.

The product of its digits is 1296, while the sum is 25.

The square root of 131338321 is about 11460.2932335957. The cubic root of 131338321 is about 508.3121454097.

The spelling of 131338321 in words is "one hundred thirty-one million, three hundred thirty-eight thousand, three hundred twenty-one".