131343421 has 4 divisors (see below), whose sum is σ = 143283744. Its totient is φ = 119403100.

The previous prime is 131343379. The next prime is 131343449. The reversal of 131343421 is 124343131.

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 131343421 - 2⁷ = 131343293 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131343392 and 131343401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131343461) 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, 5970145 + ... + 5970166.

It is an arithmetic number, because the mean of its divisors is an integer number (35820936).

Almost surely, 2^131343421 is an apocalyptic number.

131343421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131343421 is a deficient number, since it is larger than the sum of its proper divisors (11940323).

131343421 is a wasteful number, since it uses less digits than its factorization.

131343421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11940322.

The product of its digits is 864, while the sum is 22.

The square root of 131343421 is about 11460.5157388313. The cubic root of 131343421 is about 508.3187247496.

Adding to 131343421 its reverse (124343131), we get a palindrome (255686552).

The spelling of 131343421 in words is "one hundred thirty-one million, three hundred forty-three thousand, four hundred twenty-one".