131558449797 has 24 divisors (see below), whose sum is σ = 202987660824. Its totient is φ = 81815967744.

The previous prime is 131558449793. The next prime is 131558449811. The reversal of 131558449797 is 797944855131.

131558449797 is a `hidden beast` number, since 1 + 3 + 1 + 5 + 58 + 4 + 497 + 97 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 40451667876 + 91106781921 = 201126^2 + 301839^2 .

It is not a de Polignac number, because 131558449797 - 2² = 131558449793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131558449793) 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 23 ways as a sum of consecutive naturals, for example, 3787398 + ... + 3821975.

It is an arithmetic number, because the mean of its divisors is an integer number (8457819201).

Almost surely, 2^131558449797 is an apocalyptic number.

131558449797 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

131558449797 is a deficient number, since it is larger than the sum of its proper divisors (71429211027).

131558449797 is a wasteful number, since it uses less digits than its factorization.

131558449797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7609509 (or 7609506 counting only the distinct ones).

The product of its digits is 38102400, while the sum is 63.

The spelling of 131558449797 in words is "one hundred thirty-one billion, five hundred fifty-eight million, four hundred forty-nine thousand, seven hundred ninety-seven".