131885787281 has 4 divisors (see below), whose sum is σ = 132301831092. Its totient is φ = 131469743472.

The previous prime is 131885787277. The next prime is 131885787289. The reversal of 131885787281 is 182787588131.

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 65208218881 + 66677568400 = 255359^2 + 258220^2 .

It is a cyclic number.

It is not a de Polignac number, because 131885787281 - 2² = 131885787277 is a prime.

It is a super-2 number, since 2×131885787281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131885787281.

It is not an unprimeable number, because it can be changed into a prime (131885787289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208021430 + ... + 208022063.

It is an arithmetic number, because the mean of its divisors is an integer number (33075457773).

Almost surely, 2^131885787281 is an apocalyptic number.

It is an amenable number.

131885787281 is a deficient number, since it is larger than the sum of its proper divisors (416043811).

131885787281 is an equidigital number, since it uses as much as digits as its factorization.

131885787281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416043810.

The product of its digits is 6021120, while the sum is 59.

The spelling of 131885787281 in words is "one hundred thirty-one billion, eight hundred eighty-five million, seven hundred eighty-seven thousand, two hundred eighty-one".