131621503 has 4 divisors (see below), whose sum is σ = 141746248. Its totient is φ = 121496760.

The previous prime is 131621491. The next prime is 131621509. The reversal of 131621503 is 305126131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305126131 = 317 ⋅962543.

It is a cyclic number.

It is not a de Polignac number, because 131621503 - 2⁵ = 131621471 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 (131621509) 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 3 ways as a sum of consecutive naturals, for example, 5062353 + ... + 5062378.

It is an arithmetic number, because the mean of its divisors is an integer number (35436562).

Almost surely, 2^131621503 is an apocalyptic number.

131621503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

131621503 is a deficient number, since it is larger than the sum of its proper divisors (10124745).

131621503 is a wasteful number, since it uses less digits than its factorization.

131621503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10124744.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 131621503 is about 11472.6415005438. The cubic root of 131621503 is about 508.6772115437.

Adding to 131621503 its reverse (305126131), we get a palindrome (436747634).

The spelling of 131621503 in words is "one hundred thirty-one million, six hundred twenty-one thousand, five hundred three".