887171521 has 2 divisors, whose sum is σ = 887171522. Its totient is φ = 887171520.

The previous prime is 887171497. The next prime is 887171557. The reversal of 887171521 is 125171788.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 701667121 + 185504400 = 26489^2 + 13620^2 .

It is a cyclic number.

It is not a de Polignac number, because 887171521 - 2¹⁵ = 887138753 is a prime.

It is not a weakly prime, because it can be changed into another prime (887171591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 443585760 + 443585761.

It is an arithmetic number, because the mean of its divisors is an integer number (443585761).

Almost surely, 2^887171521 is an apocalyptic number.

It is an amenable number.

887171521 is a deficient number, since it is larger than the sum of its proper divisors (1).

887171521 is an equidigital number, since it uses as much as digits as its factorization.

887171521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31360, while the sum is 40.

The square root of 887171521 is about 29785.4246402498. The cubic root of 887171521 is about 960.8800960501.

The spelling of 887171521 in words is "eight hundred eighty-seven million, one hundred seventy-one thousand, five hundred twenty-one".