1231443041117 has 2 divisors, whose sum is σ = 1231443041118. Its totient is φ = 1231443041116.

The previous prime is 1231443041069. The next prime is 1231443041149. The reversal of 1231443041117 is 7111403441321.

It is an a-pointer prime, because the next prime (1231443041149) can be obtained adding 1231443041117 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1097495092996 + 133947948121 = 1047614^2 + 365989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231443041117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231443041197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615721520558 + 615721520559.

It is an arithmetic number, because the mean of its divisors is an integer number (615721520559).

Almost surely, 2^{1231443041117} is an apocalyptic number.

It is an amenable number.

1231443041117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231443041117 is an equidigital number, since it uses as much as digits as its factorization.

1231443041117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

Adding to 1231443041117 its reverse (7111403441321), we get a palindrome (8342846482438).

The spelling of 1231443041117 in words is "one trillion, two hundred thirty-one billion, four hundred forty-three million, forty-one thousand, one hundred seventeen".