131201505 has 16 divisors (see below), whose sum is σ = 233247360. Its totient is φ = 69974064.

The previous prime is 131201489. The next prime is 131201509. The reversal of 131201505 is 505102131.

It is not a de Polignac number, because 131201505 - 2⁴ = 131201489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131201509) 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 15 ways as a sum of consecutive naturals, for example, 485797 + ... + 486066.

It is an arithmetic number, because the mean of its divisors is an integer number (14577960).

Almost surely, 2^131201505 is an apocalyptic number.

131201505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131201505 is a deficient number, since it is larger than the sum of its proper divisors (102045855).

131201505 is an equidigital number, since it uses as much as digits as its factorization.

131201505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971877 (or 971871 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 131201505 is about 11454.3225465324. The cubic root of 131201505 is about 508.1355800414.

Adding to 131201505 its reverse (505102131), we get a palindrome (636303636).

The spelling of 131201505 in words is "one hundred thirty-one million, two hundred one thousand, five hundred five".