131503 has 4 divisors (see below), whose sum is σ = 132840. Its totient is φ = 130168.
The previous prime is 131501. The next prime is 131507. The reversal of 131503 is 305131.
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 131503 - 21 = 131501 is a prime.
It is a Duffinian number.
131503 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (131501) 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, 508 + ... + 721.
It is an arithmetic number, because the mean of its divisors is an integer number (33210).
2131503 is an apocalyptic number.
131503 is a deficient number, since it is larger than the sum of its proper divisors (1337).
131503 is a wasteful number, since it uses less digits than its factorization.
131503 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1336.
The product of its (nonzero) digits is 45, while the sum is 13.
The square root of 131503 is about 362.6334237215. The cubic root of 131503 is about 50.8524506315.
Adding to 131503 its reverse (305131), we get a palindrome (436634).
The spelling of 131503 in words is "one hundred thirty-one thousand, five hundred three".
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