1173043596581 has 2 divisors, whose sum is σ = 1173043596582. Its totient is φ = 1173043596580.

The previous prime is 1173043596541. The next prime is 1173043596583. The reversal of 1173043596581 is 1856953403711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 972326156356 + 200717440225 = 986066^2 + 448015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1173043596581 - 2²⁶ = 1172976487717 is a prime.

It is a super-2 number, since 2×1173043596581² (a number of 25 digits) contains 22 as substring.

Together with 1173043596583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1173043596583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 586521798290 + 586521798291.

It is an arithmetic number, because the mean of its divisors is an integer number (586521798291).

Almost surely, 2^{1173043596581} is an apocalyptic number.

It is an amenable number.

1173043596581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1173043596581 is an equidigital number, since it uses as much as digits as its factorization.

1173043596581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 1173043596581 in words is "one trillion, one hundred seventy-three billion, forty-three million, five hundred ninety-six thousand, five hundred eighty-one".