131111112331217 has 2 divisors, whose sum is σ = 131111112331218. Its totient is φ = 131111112331216.

The previous prime is 131111112331201. The next prime is 131111112331223. The reversal of 131111112331217 is 712133211111131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105690921410881 + 25420190920336 = 10280609^2 + 5041844^2 .

It is a cyclic number.

It is not a de Polignac number, because 131111112331217 - 2⁴ = 131111112331201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131111112331217.

It is not a weakly prime, because it can be changed into another prime (131111112331247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65555556165608 + 65555556165609.

It is an arithmetic number, because the mean of its divisors is an integer number (65555556165609).

Almost surely, 2^{131111112331217} is an apocalyptic number.

It is an amenable number.

131111112331217 is a deficient number, since it is larger than the sum of its proper divisors (1).

131111112331217 is an equidigital number, since it uses as much as digits as its factorization.

131111112331217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 29.

Adding to 131111112331217 its reverse (712133211111131), we get a palindrome (843244323442348).

The spelling of 131111112331217 in words is "one hundred thirty-one trillion, one hundred eleven billion, one hundred twelve million, three hundred thirty-one thousand, two hundred seventeen".