873252731521 has 2 divisors, whose sum is σ = 873252731522. Its totient is φ = 873252731520.

The previous prime is 873252731503. The next prime is 873252731557. The reversal of 873252731521 is 125137252378.

873252731521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 870795050896 + 2457680625 = 933164^2 + 49575^2 .

It is a cyclic number.

It is not a de Polignac number, because 873252731521 - 2²⁷ = 873118513793 is a prime.

It is not a weakly prime, because it can be changed into another prime (873252731581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436626365760 + 436626365761.

It is an arithmetic number, because the mean of its divisors is an integer number (436626365761).

Almost surely, 2^873252731521 is an apocalyptic number.

It is an amenable number.

873252731521 is a deficient number, since it is larger than the sum of its proper divisors (1).

873252731521 is an equidigital number, since it uses as much as digits as its factorization.

873252731521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 46.

Adding to 873252731521 its reverse (125137252378), we get a palindrome (998389983899).

The spelling of 873252731521 in words is "eight hundred seventy-three billion, two hundred fifty-two million, seven hundred thirty-one thousand, five hundred twenty-one".