131334521 has 4 divisors (see below), whose sum is σ = 134537844. Its totient is φ = 128131200.

The previous prime is 131334509. The next prime is 131334527. The reversal of 131334521 is 125433131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12524521 + 118810000 = 3539^2 + 10900^2 .

It is a cyclic number.

It is not a de Polignac number, because 131334521 - 2⁶ = 131334457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131334527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1601600 + ... + 1601681.

It is an arithmetic number, because the mean of its divisors is an integer number (33634461).

Almost surely, 2^131334521 is an apocalyptic number.

It is an amenable number.

131334521 is a deficient number, since it is larger than the sum of its proper divisors (3203323).

131334521 is an equidigital number, since it uses as much as digits as its factorization.

131334521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3203322.

The product of its digits is 1080, while the sum is 23.

The square root of 131334521 is about 11460.1274425724. The cubic root of 131334521 is about 508.3072430457.

Adding to 131334521 its reverse (125433131), we get a palindrome (256767652).

The spelling of 131334521 in words is "one hundred thirty-one million, three hundred thirty-four thousand, five hundred twenty-one".