131423329 has 4 divisors (see below), whose sum is σ = 131997460. Its totient is φ = 130849200.

The previous prime is 131423317. The next prime is 131423333. The reversal of 131423329 is 923324131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 923324131 = 281 ⋅3285851.

It can be written as a sum of positive squares in 2 ways, for example, as 57032704 + 74390625 = 7552^2 + 8625^2 .

It is a cyclic number.

It is not a de Polignac number, because 131423329 - 2⁹ = 131422817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131423297 and 131423306.

It is not an unprimeable number, because it can be changed into a prime (131423309) 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, 286722 + ... + 287179.

It is an arithmetic number, because the mean of its divisors is an integer number (32999365).

Almost surely, 2^131423329 is an apocalyptic number.

It is an amenable number.

131423329 is a deficient number, since it is larger than the sum of its proper divisors (574131).

131423329 is an equidigital number, since it uses as much as digits as its factorization.

131423329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574130.

The product of its digits is 3888, while the sum is 28.

The square root of 131423329 is about 11464.0014392881. The cubic root of 131423329 is about 508.4217891635.

It can be divided in two parts, 13142 and 3329, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 131423329 in words is "one hundred thirty-one million, four hundred twenty-three thousand, three hundred twenty-nine".