1231345315559 has 2 divisors, whose sum is σ = 1231345315560. Its totient is φ = 1231345315558.

The previous prime is 1231345315517. The next prime is 1231345315621. The reversal of 1231345315559 is 9555135431321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231345315559 - 2⁸ = 1231345315303 is a prime.

It is a super-2 number, since 2×1231345315559² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231345315259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615672657779 + 615672657780.

It is an arithmetic number, because the mean of its divisors is an integer number (615672657780).

Almost surely, 2^{1231345315559} is an apocalyptic number.

1231345315559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231345315559 is an equidigital number, since it uses as much as digits as its factorization.

1231345315559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1215000, while the sum is 47.

The spelling of 1231345315559 in words is "one trillion, two hundred thirty-one billion, three hundred forty-five million, three hundred fifteen thousand, five hundred fifty-nine".