987643193 has 2 divisors, whose sum is σ = 987643194. Its totient is φ = 987643192.

The previous prime is 987643171. The next prime is 987643211. The reversal of 987643193 is 391346789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 954315664 + 33327529 = 30892^2 + 5773^2 .

It is a cyclic number.

It is not a de Polignac number, because 987643193 - 2¹⁸ = 987381049 is a prime.

It is not a weakly prime, because it can be changed into another prime (987643493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493821596 + 493821597.

It is an arithmetic number, because the mean of its divisors is an integer number (493821597).

Almost surely, 2^987643193 is an apocalyptic number.

It is an amenable number.

987643193 is a deficient number, since it is larger than the sum of its proper divisors (1).

987643193 is an equidigital number, since it uses as much as digits as its factorization.

987643193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The square root of 987643193 is about 31426.7910070373. The cubic root of 987643193 is about 995.8639812668.

The spelling of 987643193 in words is "nine hundred eighty-seven million, six hundred forty-three thousand, one hundred ninety-three".