131020503 has 4 divisors (see below), whose sum is σ = 174694008. Its totient is φ = 87347000.

The previous prime is 131020501. The next prime is 131020531. The reversal of 131020503 is 305020131.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 131020503 - 2¹ = 131020501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131020501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21836748 + ... + 21836753.

It is an arithmetic number, because the mean of its divisors is an integer number (43673502).

Almost surely, 2^131020503 is an apocalyptic number.

131020503 is a deficient number, since it is larger than the sum of its proper divisors (43673505).

131020503 is an equidigital number, since it uses as much as digits as its factorization.

131020503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43673504.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 131020503 is about 11446.4187849301. The cubic root of 131020503 is about 507.9018025314.

Adding to 131020503 its reverse (305020131), we get a palindrome (436040634).

The spelling of 131020503 in words is "one hundred thirty-one million, twenty thousand, five hundred three".