131326861721 has 32 divisors (see below), whose sum is σ = 153161280000. Its totient is φ = 111279329280.

The previous prime is 131326861693. The next prime is 131326861727. The reversal of 131326861721 is 127168623131.

It is a cyclic number.

It is not a de Polignac number, because 131326861721 - 2¹⁸ = 131326599577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131326861727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42239315 + ... + 42242423.

It is an arithmetic number, because the mean of its divisors is an integer number (4786290000).

Almost surely, 2^131326861721 is an apocalyptic number.

131326861721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131326861721 is a deficient number, since it is larger than the sum of its proper divisors (21834418279).

131326861721 is a wasteful number, since it uses less digits than its factorization.

131326861721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5249.

The product of its digits is 72576, while the sum is 41.

The spelling of 131326861721 in words is "one hundred thirty-one billion, three hundred twenty-six million, eight hundred sixty-one thousand, seven hundred twenty-one".