131240237617 has 2 divisors, whose sum is σ = 131240237618. Its totient is φ = 131240237616.

The previous prime is 131240237603. The next prime is 131240237641. The reversal of 131240237617 is 716732042131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120267465616 + 10972772001 = 346796^2 + 104751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131240237617 is a prime.

It is not a weakly prime, because it can be changed into another prime (131240237657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65620118808 + 65620118809.

It is an arithmetic number, because the mean of its divisors is an integer number (65620118809).

Almost surely, 2^131240237617 is an apocalyptic number.

It is an amenable number.

131240237617 is a deficient number, since it is larger than the sum of its proper divisors (1).

131240237617 is an equidigital number, since it uses as much as digits as its factorization.

131240237617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 37.

Adding to 131240237617 its reverse (716732042131), we get a palindrome (847972279748).

The spelling of 131240237617 in words is "one hundred thirty-one billion, two hundred forty million, two hundred thirty-seven thousand, six hundred seventeen".