131603173 has 6 divisors (see below), whose sum is σ = 142505394. Its totient is φ = 121479696.

The previous prime is 131603161. The next prime is 131603179. The reversal of 131603173 is 371306131.

It can be written as a sum of positive squares in 3 ways, for example, as 1483524 + 130119649 = 1218^2 + 11407^2 .

It is a de Polignac number, because none of the positive numbers 2^k-131603173 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 (131603179) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 389190 + ... + 389527.

It is an arithmetic number, because the mean of its divisors is an integer number (23750899).

Almost surely, 2^131603173 is an apocalyptic number.

131603173 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

131603173 is a deficient number, since it is larger than the sum of its proper divisors (10902221).

131603173 is an equidigital number, since it uses as much as digits as its factorization.

131603173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778743 (or 778730 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 131603173 is about 11471.8426157266. The cubic root of 131603173 is about 508.6535971495.

The spelling of 131603173 in words is "one hundred thirty-one million, six hundred three thousand, one hundred seventy-three".