231211105717 has 2 divisors, whose sum is σ = 231211105718. Its totient is φ = 231211105716.

The previous prime is 231211105681. The next prime is 231211105739. The reversal of 231211105717 is 717501112132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120943277361 + 110267828356 = 347769^2 + 332066^2 .

It is a cyclic number.

It is not a de Polignac number, because 231211105717 - 2⁷ = 231211105589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231211105757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115605552858 + 115605552859.

It is an arithmetic number, because the mean of its divisors is an integer number (115605552859).

Almost surely, 2^231211105717 is an apocalyptic number.

It is an amenable number.

231211105717 is a deficient number, since it is larger than the sum of its proper divisors (1).

231211105717 is an equidigital number, since it uses as much as digits as its factorization.

231211105717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 31.

Adding to 231211105717 its reverse (717501112132), we get a palindrome (948712217849).

The spelling of 231211105717 in words is "two hundred thirty-one billion, two hundred eleven million, one hundred five thousand, seven hundred seventeen".