131504521 has 4 divisors (see below), whose sum is σ = 131540500. Its totient is φ = 131468544.

The previous prime is 131504509. The next prime is 131504533. The reversal of 131504521 is 125405131.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (131504509) and next prime (131504533).

It can be written as a sum of positive squares in 2 ways, for example, as 69488896 + 62015625 = 8336^2 + 7875^2 .

It is a cyclic number.

It is not a de Polignac number, because 131504521 - 2⁵ = 131504489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131504492 and 131504501.

It is not an unprimeable number, because it can be changed into a prime (131504551) 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, 11796 + ... + 20053.

It is an arithmetic number, because the mean of its divisors is an integer number (32885125).

Almost surely, 2^131504521 is an apocalyptic number.

It is an amenable number.

131504521 is a deficient number, since it is larger than the sum of its proper divisors (35979).

131504521 is an equidigital number, since it uses as much as digits as its factorization.

131504521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35978.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 131504521 is about 11467.5420644530. The cubic root of 131504521 is about 508.5264668855.

Adding to 131504521 its reverse (125405131), we get a palindrome (256909652).

It can be divided in two parts, 13150 and 4521, that added together give a palindrome (17671).

The spelling of 131504521 in words is "one hundred thirty-one million, five hundred four thousand, five hundred twenty-one".