131531503 has 8 divisors (see below), whose sum is σ = 137431008. Its totient is φ = 125647104.

The previous prime is 131531489. The next prime is 131531557. The reversal of 131531503 is 305135131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131531503 - 2⁹ = 131530991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131531203) 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 7 ways as a sum of consecutive naturals, for example, 16375 + ... + 23047.

It is an arithmetic number, because the mean of its divisors is an integer number (17178876).

Almost surely, 2^131531503 is an apocalyptic number.

131531503 is a deficient number, since it is larger than the sum of its proper divisors (5899505).

131531503 is an equidigital number, since it uses as much as digits as its factorization.

131531503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7553.

The product of its (nonzero) digits is 675, while the sum is 22.

The square root of 131531503 is about 11468.7184549975. The cubic root of 131531503 is about 508.5612442014.

Adding to 131531503 its reverse (305135131), we get a palindrome (436666634).

The spelling of 131531503 in words is "one hundred thirty-one million, five hundred thirty-one thousand, five hundred three".