873218987 has 2 divisors, whose sum is σ = 873218988. Its totient is φ = 873218986.

The previous prime is 873218977. The next prime is 873219001. The reversal of 873218987 is 789812378.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 873218987 - 2¹⁰ = 873217963 is a prime.

It is a super-2 number, since 2×873218987² = 1525022798514612338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (873218917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436609493 + 436609494.

It is an arithmetic number, because the mean of its divisors is an integer number (436609494).

Almost surely, 2^873218987 is an apocalyptic number.

873218987 is a deficient number, since it is larger than the sum of its proper divisors (1).

873218987 is an equidigital number, since it uses as much as digits as its factorization.

873218987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 53.

The square root of 873218987 is about 29550.2789665343. The cubic root of 873218987 is about 955.8162067239.

The spelling of 873218987 in words is "eight hundred seventy-three million, two hundred eighteen thousand, nine hundred eighty-seven".