131323421 has 4 divisors (see below), whose sum is σ = 138235200. Its totient is φ = 124411644.

The previous prime is 131323411. The next prime is 131323441. The reversal of 131323421 is 124323131.

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.

It is a cyclic number.

It is not a de Polignac number, because 131323421 - 2¹⁸ = 131061277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 131323393 and 131323402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131323411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3455861 + ... + 3455898.

It is an arithmetic number, because the mean of its divisors is an integer number (34558800).

Almost surely, 2^131323421 is an apocalyptic number.

It is an amenable number.

131323421 is a deficient number, since it is larger than the sum of its proper divisors (6911779).

131323421 is an equidigital number, since it uses as much as digits as its factorization.

131323421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6911778.

The product of its digits is 432, while the sum is 20.

The square root of 131323421 is about 11459.6431445312. The cubic root of 131323421 is about 508.2929224407.

Adding to 131323421 its reverse (124323131), we get a palindrome (255646552).

The spelling of 131323421 in words is "one hundred thirty-one million, three hundred twenty-three thousand, four hundred twenty-one".