987654197 has 2 divisors, whose sum is σ = 987654198. Its totient is φ = 987654196.

The previous prime is 987654179. The next prime is 987654211. The reversal of 987654197 is 791456789.

Together with previous prime (987654179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 730404676 + 257249521 = 27026^2 + 16039^2 .

It is an emirp because it is prime and its reverse (791456789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 987654197 - 2⁶ = 987654133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987654137) 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, 493827098 + 493827099.

It is an arithmetic number, because the mean of its divisors is an integer number (493827099).

Almost surely, 2^987654197 is an apocalyptic number.

It is an amenable number.

987654197 is a deficient number, since it is larger than the sum of its proper divisors (1).

987654197 is an equidigital number, since it uses as much as digits as its factorization.

987654197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 56.

The square root of 987654197 is about 31426.9660801039. The cubic root of 987654197 is about 995.8676797842.

The spelling of 987654197 in words is "nine hundred eighty-seven million, six hundred fifty-four thousand, one hundred ninety-seven".