987643211 has 2 divisors, whose sum is σ = 987643212. Its totient is φ = 987643210.

The previous prime is 987643193. The next prime is 987643213. The reversal of 987643211 is 112346789.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987643211 is a prime.

It is a super-2 number, since 2×987643211² = 1950878224468781042, which contains 22 as substring.

Together with 987643213, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (987643213) 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, 493821605 + 493821606.

It is an arithmetic number, because the mean of its divisors is an integer number (493821606).

Almost surely, 2^987643211 is an apocalyptic number.

987643211 is a deficient number, since it is larger than the sum of its proper divisors (1).

987643211 is an equidigital number, since it uses as much as digits as its factorization.

987643211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 987643211 is about 31426.7912934172. The cubic root of 987643211 is about 995.8639873168.

The spelling of 987643211 in words is "nine hundred eighty-seven million, six hundred forty-three thousand, two hundred eleven".