131516503 has 4 divisors (see below), whose sum is σ = 132276888. Its totient is φ = 130756120.

The previous prime is 131516467. The next prime is 131516509. The reversal of 131516503 is 305615131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305615131 = 10321 ⋅29611.

It is a cyclic number.

It is not a de Polignac number, because 131516503 - 2²⁵ = 97962071 is a prime.

It is a super-2 number, since 2×131516503² = 34593181122698018, 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 (131516509) 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, 379933 + ... + 380278.

It is an arithmetic number, because the mean of its divisors is an integer number (33069222).

Almost surely, 2^131516503 is an apocalyptic number.

131516503 is a deficient number, since it is larger than the sum of its proper divisors (760385).

131516503 is an equidigital number, since it uses as much as digits as its factorization.

131516503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760384.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 131516503 is about 11468.0644835997. The cubic root of 131516503 is about 508.5419111684.

The spelling of 131516503 in words is "one hundred thirty-one million, five hundred sixteen thousand, five hundred three".