887765621 has 2 divisors, whose sum is σ = 887765622. Its totient is φ = 887765620.

The previous prime is 887765597. The next prime is 887765639. The reversal of 887765621 is 126567788.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 873852721 + 13912900 = 29561^2 + 3730^2 .

It is a cyclic number.

It is not a de Polignac number, because 887765621 - 2¹⁴ = 887749237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 887765621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (887765521) 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, 443882810 + 443882811.

It is an arithmetic number, because the mean of its divisors is an integer number (443882811).

Almost surely, 2^887765621 is an apocalyptic number.

It is an amenable number.

887765621 is a deficient number, since it is larger than the sum of its proper divisors (1).

887765621 is an equidigital number, since it uses as much as digits as its factorization.

887765621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 50.

The square root of 887765621 is about 29795.3959698474. The cubic root of 887765621 is about 961.0945346611.

The spelling of 887765621 in words is "eight hundred eighty-seven million, seven hundred sixty-five thousand, six hundred twenty-one".