131540321 has 4 divisors (see below), whose sum is σ = 143498544. Its totient is φ = 119582100.

The previous prime is 131540267. The next prime is 131540333. The reversal of 131540321 is 123045131.

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: 123045131 = 11 ⋅11185921.

It is not a de Polignac number, because 131540321 - 2⁶ = 131540257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131540293 and 131540302.

It is not an unprimeable number, because it can be changed into a prime (131540221) 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, 5979095 + ... + 5979116.

It is an arithmetic number, because the mean of its divisors is an integer number (35874636).

Almost surely, 2^131540321 is an apocalyptic number.

131540321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131540321 is a deficient number, since it is larger than the sum of its proper divisors (11958223).

131540321 is a wasteful number, since it uses less digits than its factorization.

131540321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11958222.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 131540321 is about 11469.1028855792. The cubic root of 131540321 is about 508.5726087610.

Adding to 131540321 its reverse (123045131), we get a palindrome (254585452).

The spelling of 131540321 in words is "one hundred thirty-one million, five hundred forty thousand, three hundred twenty-one".