131306524721 has 2 divisors, whose sum is σ = 131306524722. Its totient is φ = 131306524720.

The previous prime is 131306524717. The next prime is 131306524729. The reversal of 131306524721 is 127425603131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105742032400 + 25564492321 = 325180^2 + 159889^2 .

It is a cyclic number.

It is not a de Polignac number, because 131306524721 - 2² = 131306524717 is a prime.

It is not a weakly prime, because it can be changed into another prime (131306524729) 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 as a sum of consecutive naturals, namely, 65653262360 + 65653262361.

It is an arithmetic number, because the mean of its divisors is an integer number (65653262361).

Almost surely, 2^131306524721 is an apocalyptic number.

It is an amenable number.

131306524721 is a deficient number, since it is larger than the sum of its proper divisors (1).

131306524721 is an equidigital number, since it uses as much as digits as its factorization.

131306524721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 131306524721 in words is "one hundred thirty-one billion, three hundred six million, five hundred twenty-four thousand, seven hundred twenty-one".