887765009 has 2 divisors, whose sum is σ = 887765010. Its totient is φ = 887765008.

The previous prime is 887764979. The next prime is 887765029. The reversal of 887765009 is 900567788.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445083409 + 442681600 = 21097^2 + 21040^2 .

It is a cyclic number.

It is not a de Polignac number, because 887765009 - 2¹⁶ = 887699473 is a prime.

It is a super-2 number, since 2×887765009² = 1576253422409540162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (887765029) 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, 443882504 + 443882505.

It is an arithmetic number, because the mean of its divisors is an integer number (443882505).

Almost surely, 2^887765009 is an apocalyptic number.

It is an amenable number.

887765009 is a deficient number, since it is larger than the sum of its proper divisors (1).

887765009 is an equidigital number, since it uses as much as digits as its factorization.

887765009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 887765009 is about 29795.3856998026. The cubic root of 887765009 is about 961.0943138108.

The spelling of 887765009 in words is "eight hundred eighty-seven million, seven hundred sixty-five thousand, nine".