131223215253817 has 2 divisors, whose sum is σ = 131223215253818. Its totient is φ = 131223215253816.

The previous prime is 131223215253799. The next prime is 131223215253929. The reversal of 131223215253817 is 718352512322131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70263020348416 + 60960194905401 = 8382304^2 + 7807701^2 .

It is a cyclic number.

It is not a de Polignac number, because 131223215253817 - 2³⁵ = 131188855515449 is a prime.

It is not a weakly prime, because it can be changed into another prime (131223215253617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65611607626908 + 65611607626909.

It is an arithmetic number, because the mean of its divisors is an integer number (65611607626909).

Almost surely, 2^{131223215253817} is an apocalyptic number.

It is an amenable number.

131223215253817 is a deficient number, since it is larger than the sum of its proper divisors (1).

131223215253817 is an equidigital number, since it uses as much as digits as its factorization.

131223215253817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 46.

Adding to 131223215253817 its reverse (718352512322131), we get a palindrome (849575727575948).

The spelling of 131223215253817 in words is "one hundred thirty-one trillion, two hundred twenty-three billion, two hundred fifteen million, two hundred fifty-three thousand, eight hundred seventeen".