987123113 has 2 divisors, whose sum is σ = 987123114. Its totient is φ = 987123112.

The previous prime is 987123107. The next prime is 987123209. The reversal of 987123113 is 311321789.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 891141904 + 95981209 = 29852^2 + 9797^2 .

It is an emirp because it is prime and its reverse (311321789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 987123113 - 2⁴ = 987123097 is a prime.

It is not a weakly prime, because it can be changed into another prime (987123413) 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, 493561556 + 493561557.

It is an arithmetic number, because the mean of its divisors is an integer number (493561557).

Almost surely, 2^987123113 is an apocalyptic number.

It is an amenable number.

987123113 is a deficient number, since it is larger than the sum of its proper divisors (1).

987123113 is an equidigital number, since it uses as much as digits as its factorization.

987123113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 987123113 is about 31418.5154486968. The cubic root of 987123113 is about 995.6891475883.

The spelling of 987123113 in words is "nine hundred eighty-seven million, one hundred twenty-three thousand, one hundred thirteen".