131111516321 has 2 divisors, whose sum is σ = 131111516322. Its totient is φ = 131111516320.

The previous prime is 131111516317. The next prime is 131111516411. The reversal of 131111516321 is 123615111131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106987213921 + 24124302400 = 327089^2 + 155320^2 .

It is a cyclic number.

It is not a de Polignac number, because 131111516321 - 2² = 131111516317 is a prime.

It is not a weakly prime, because it can be changed into another prime (131111516311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65555758160 + 65555758161.

It is an arithmetic number, because the mean of its divisors is an integer number (65555758161).

Almost surely, 2^131111516321 is an apocalyptic number.

It is an amenable number.

131111516321 is a deficient number, since it is larger than the sum of its proper divisors (1).

131111516321 is an equidigital number, since it uses as much as digits as its factorization.

131111516321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 26.

Adding to 131111516321 its reverse (123615111131), we get a palindrome (254726627452).

The spelling of 131111516321 in words is "one hundred thirty-one billion, one hundred eleven million, five hundred sixteen thousand, three hundred twenty-one".