131886781017 has 4 divisors (see below), whose sum is σ = 175849041360. Its totient is φ = 87924520676.

The previous prime is 131886781007. The next prime is 131886781027. The reversal of 131886781017 is 710187688131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (131886781007) and next prime (131886781027).

It is a cyclic number.

It is not a de Polignac number, because 131886781017 - 2⁴ = 131886781001 is a prime.

It is a super-2 number, since 2×131886781017² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131886781007) 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 3 ways as a sum of consecutive naturals, for example, 21981130167 + ... + 21981130172.

It is an arithmetic number, because the mean of its divisors is an integer number (43962260340).

Almost surely, 2^131886781017 is an apocalyptic number.

It is an amenable number.

131886781017 is a deficient number, since it is larger than the sum of its proper divisors (43962260343).

131886781017 is an equidigital number, since it uses as much as digits as its factorization.

131886781017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43962260342.

The product of its (nonzero) digits is 451584, while the sum is 51.

The spelling of 131886781017 in words is "one hundred thirty-one billion, eight hundred eighty-six million, seven hundred eighty-one thousand, seventeen".