131546721 has 4 divisors (see below), whose sum is σ = 175395632. Its totient is φ = 87697812.

The previous prime is 131546719. The next prime is 131546773. The reversal of 131546721 is 127645131.

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: 127645131 = 3 ⋅42548377.

It is not a de Polignac number, because 131546721 - 2¹ = 131546719 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131546711) 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, 21924451 + ... + 21924456.

It is an arithmetic number, because the mean of its divisors is an integer number (43848908).

Almost surely, 2^131546721 is an apocalyptic number.

It is an amenable number.

131546721 is a deficient number, since it is larger than the sum of its proper divisors (43848911).

131546721 is an equidigital number, since it uses as much as digits as its factorization.

131546721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43848910.

The product of its digits is 5040, while the sum is 30.

The square root of 131546721 is about 11469.3818926741. The cubic root of 131546721 is about 508.5808567058.

The spelling of 131546721 in words is "one hundred thirty-one million, five hundred forty-six thousand, seven hundred twenty-one".