131261487571 has 4 divisors (see below), whose sum is σ = 131683550544. Its totient is φ = 130839424600.

The previous prime is 131261487563. The next prime is 131261487583. The reversal of 131261487571 is 175784162131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 175784162131 = 1291 ⋅136161241.

It is a cyclic number.

It is not a de Polignac number, because 131261487571 - 2³ = 131261487563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131261487521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211031020 + ... + 211031641.

It is an arithmetic number, because the mean of its divisors is an integer number (32920887636).

Almost surely, 2^131261487571 is an apocalyptic number.

131261487571 is a deficient number, since it is larger than the sum of its proper divisors (422062973).

131261487571 is an equidigital number, since it uses as much as digits as its factorization.

131261487571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422062972.

The product of its digits is 282240, while the sum is 46.

The spelling of 131261487571 in words is "one hundred thirty-one billion, two hundred sixty-one million, four hundred eighty-seven thousand, five hundred seventy-one".