131240237657 has 2 divisors, whose sum is σ = 131240237658. Its totient is φ = 131240237656.

The previous prime is 131240237641. The next prime is 131240237663. The reversal of 131240237657 is 756732042131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66572256256 + 64667981401 = 258016^2 + 254299^2 .

It is a cyclic number.

It is not a de Polignac number, because 131240237657 - 2⁴ = 131240237641 is a prime.

It is not a weakly prime, because it can be changed into another prime (131240237617) 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 as a sum of consecutive naturals, namely, 65620118828 + 65620118829.

It is an arithmetic number, because the mean of its divisors is an integer number (65620118829).

Almost surely, 2^131240237657 is an apocalyptic number.

It is an amenable number.

131240237657 is a deficient number, since it is larger than the sum of its proper divisors (1).

131240237657 is an equidigital number, since it uses as much as digits as its factorization.

131240237657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 41.

Adding to 131240237657 its reverse (756732042131), we get a palindrome (887972279788).

The spelling of 131240237657 in words is "one hundred thirty-one billion, two hundred forty million, two hundred thirty-seven thousand, six hundred fifty-seven".