987847123 has 2 divisors, whose sum is σ = 987847124. Its totient is φ = 987847122.

The previous prime is 987847117. The next prime is 987847181. The reversal of 987847123 is 321748789.

It is a weak prime.

It is an emirp because it is prime and its reverse (321748789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 987847123 - 2¹³ = 987838931 is a prime.

It is not a weakly prime, because it can be changed into another prime (987847103) 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, 493923561 + 493923562.

It is an arithmetic number, because the mean of its divisors is an integer number (493923562).

Almost surely, 2^987847123 is an apocalyptic number.

987847123 is a deficient number, since it is larger than the sum of its proper divisors (1).

987847123 is an equidigital number, since it uses as much as digits as its factorization.

987847123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 49.

The square root of 987847123 is about 31430.0353642817. The cubic root of 987847123 is about 995.9325190299.

The spelling of 987847123 in words is "nine hundred eighty-seven million, eight hundred forty-seven thousand, one hundred twenty-three".