987199009 has 2 divisors, whose sum is σ = 987199010. Its totient is φ = 987199008.

The previous prime is 987198967. The next prime is 987199019. The reversal of 987199009 is 900991789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 536061409 + 451137600 = 23153^2 + 21240^2 .

It is a cyclic number.

It is not a de Polignac number, because 987199009 - 2⁷ = 987198881 is a prime.

It is not a weakly prime, because it can be changed into another prime (987199019) 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, 493599504 + 493599505.

It is an arithmetic number, because the mean of its divisors is an integer number (493599505).

Almost surely, 2^987199009 is an apocalyptic number.

It is an amenable number.

987199009 is a deficient number, since it is larger than the sum of its proper divisors (1).

987199009 is an equidigital number, since it uses as much as digits as its factorization.

987199009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 987199009 is about 31419.7232483038. The cubic root of 987199009 is about 995.7146651372.

The spelling of 987199009 in words is "nine hundred eighty-seven million, one hundred ninety-nine thousand, nine".