131587575128021 has 2 divisors, whose sum is σ = 131587575128022. Its totient is φ = 131587575128020.

The previous prime is 131587575128011. The next prime is 131587575128117. The reversal of 131587575128021 is 120821575785131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66734930031025 + 64852645096996 = 8169145^2 + 8053114^2 .

It is a cyclic number.

It is not a de Polignac number, because 131587575128021 - 2¹⁴ = 131587575111637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131587575128011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65793787564010 + 65793787564011.

It is an arithmetic number, because the mean of its divisors is an integer number (65793787564011).

Almost surely, 2^{131587575128021} is an apocalyptic number.

It is an amenable number.

131587575128021 is a deficient number, since it is larger than the sum of its proper divisors (1).

131587575128021 is an equidigital number, since it uses as much as digits as its factorization.

131587575128021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704000, while the sum is 56.

The spelling of 131587575128021 in words is "one hundred thirty-one trillion, five hundred eighty-seven billion, five hundred seventy-five million, one hundred twenty-eight thousand, twenty-one".