887968721 has 2 divisors, whose sum is σ = 887968722. Its totient is φ = 887968720.

The previous prime is 887968699. The next prime is 887968723. The reversal of 887968721 is 127869788.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 791634496 + 96334225 = 28136^2 + 9815^2 .

It is a cyclic number.

It is not a de Polignac number, because 887968721 - 2¹⁰ = 887967697 is a prime.

Together with 887968723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (887968723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 443984360 + 443984361.

It is an arithmetic number, because the mean of its divisors is an integer number (443984361).

Almost surely, 2^887968721 is an apocalyptic number.

It is an amenable number.

887968721 is a deficient number, since it is larger than the sum of its proper divisors (1).

887968721 is an equidigital number, since it uses as much as digits as its factorization.

887968721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 56.

The square root of 887968721 is about 29798.8040196247. The cubic root of 887968721 is about 961.1678210525.

The spelling of 887968721 in words is "eight hundred eighty-seven million, nine hundred sixty-eight thousand, seven hundred twenty-one".