131320256305 has 32 divisors (see below), whose sum is σ = 185209576704. Its totient is φ = 87523328256.

The previous prime is 131320256267. The next prime is 131320256359. The reversal of 131320256305 is 503652023131.

It is a de Polignac number, because none of the positive numbers 2^k-131320256305 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132322 + ... + 529291.

It is an arithmetic number, because the mean of its divisors is an integer number (5787799272).

Almost surely, 2^131320256305 is an apocalyptic number.

It is an amenable number.

131320256305 is a deficient number, since it is larger than the sum of its proper divisors (53889320399).

131320256305 is a wasteful number, since it uses less digits than its factorization.

131320256305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661785.

The product of its (nonzero) digits is 16200, while the sum is 31.

Adding to 131320256305 its reverse (503652023131), we get a palindrome (634972279436).

The spelling of 131320256305 in words is "one hundred thirty-one billion, three hundred twenty million, two hundred fifty-six thousand, three hundred five".