987122089 has 2 divisors, whose sum is σ = 987122090. Its totient is φ = 987122088.

The previous prime is 987122063. The next prime is 987122111. The reversal of 987122089 is 980221789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638067600 + 349054489 = 25260^2 + 18683^2 .

It is an emirp because it is prime and its reverse (980221789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 987122089 - 2¹¹ = 987120041 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (987125089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493561044 + 493561045.

It is an arithmetic number, because the mean of its divisors is an integer number (493561045).

Almost surely, 2^987122089 is an apocalyptic number.

It is an amenable number.

987122089 is a deficient number, since it is larger than the sum of its proper divisors (1).

987122089 is an equidigital number, since it uses as much as digits as its factorization.

987122089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 987122089 is about 31418.4991525693. The cubic root of 987122089 is about 995.6888032929.

The spelling of 987122089 in words is "nine hundred eighty-seven million, one hundred twenty-two thousand, eighty-nine".