131000503 has 4 divisors (see below), whose sum is σ = 131868208. Its totient is φ = 130132800.

The previous prime is 131000491. The next prime is 131000509. The reversal of 131000503 is 305000131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305000131 = 8069 ⋅37799.

It is a cyclic number.

It is not a de Polignac number, because 131000503 - 2¹³ = 130992311 is a prime.

It is a super-2 number, since 2×131000503² = 34322263572506018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131000509) 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, 433626 + ... + 433927.

It is an arithmetic number, because the mean of its divisors is an integer number (32967052).

Almost surely, 2^131000503 is an apocalyptic number.

131000503 is a deficient number, since it is larger than the sum of its proper divisors (867705).

131000503 is an equidigital number, since it uses as much as digits as its factorization.

131000503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867704.

The product of its (nonzero) digits is 45, while the sum is 13.

The square root of 131000503 is about 11445.5451158955. The cubic root of 131000503 is about 507.8759578411.

Adding to 131000503 its reverse (305000131), we get a palindrome (436000634).

The spelling of 131000503 in words is "one hundred thirty-one million, five hundred three", and thus it is an aban number.