99987089 has 2 divisors, whose sum is σ = 99987090. Its totient is φ = 99987088.

The previous prime is 99987067. The next prime is 99987103. The reversal of 99987089 is 98078999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92006464 + 7980625 = 9592^2 + 2825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99987089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99887089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49993544 + 49993545.

It is an arithmetic number, because the mean of its divisors is an integer number (49993545).

Almost surely, 2^99987089 is an apocalyptic number.

It is an amenable number.

99987089 is a deficient number, since it is larger than the sum of its proper divisors (1).

99987089 is an equidigital number, since it uses as much as digits as its factorization.

99987089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 59.

The square root of 99987089 is about 9999.3544291619. The cubic root of 99987089 is about 464.1389066504.

It can be divided in two parts, 999 and 87089, that added together give a palindrome (88088).

The spelling of 99987089 in words is "ninety-nine million, nine hundred eighty-seven thousand, eighty-nine".