131207305 has 4 divisors (see below), whose sum is σ = 157448772. Its totient is φ = 104965840.

The previous prime is 131207287. The next prime is 131207311. The reversal of 131207305 is 503702131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70694464 + 60512841 = 8408^2 + 7779^2 .

It is not a de Polignac number, because 131207305 - 2⁵ = 131207273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13120726 + ... + 13120735.

It is an arithmetic number, because the mean of its divisors is an integer number (39362193).

Almost surely, 2^131207305 is an apocalyptic number.

It is an amenable number.

131207305 is a deficient number, since it is larger than the sum of its proper divisors (26241467).

131207305 is an equidigital number, since it uses as much as digits as its factorization.

131207305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26241466.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 131207305 is about 11454.5757232645. The cubic root of 131207305 is about 508.1430676154.

Adding to 131207305 its reverse (503702131), we get a palindrome (634909436).

The spelling of 131207305 in words is "one hundred thirty-one million, two hundred seven thousand, three hundred five".