873191365997 has 2 divisors, whose sum is σ = 873191365998. Its totient is φ = 873191365996.

The previous prime is 873191365993. The next prime is 873191366027. The reversal of 873191365997 is 799563191378.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515795439721 + 357395926276 = 718189^2 + 597826^2 .

It is a cyclic number.

It is not a de Polignac number, because 873191365997 - 2² = 873191365993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (873191365993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436595682998 + 436595682999.

It is an arithmetic number, because the mean of its divisors is an integer number (436595682999).

Almost surely, 2^873191365997 is an apocalyptic number.

It is an amenable number.

873191365997 is a deficient number, since it is larger than the sum of its proper divisors (1).

873191365997 is an equidigital number, since it uses as much as digits as its factorization.

873191365997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77157360, while the sum is 68.

The spelling of 873191365997 in words is "eight hundred seventy-three billion, one hundred ninety-one million, three hundred sixty-five thousand, nine hundred ninety-seven".