985214891 has 2 divisors, whose sum is σ = 985214892. Its totient is φ = 985214890.

The previous prime is 985214887. The next prime is 985214899. The reversal of 985214891 is 198412589.

It is a weak prime.

It is an emirp because it is prime and its reverse (198412589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 985214891 - 2² = 985214887 is a prime.

It is not a weakly prime, because it can be changed into another prime (985214899) 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, 492607445 + 492607446.

It is an arithmetic number, because the mean of its divisors is an integer number (492607446).

Almost surely, 2^985214891 is an apocalyptic number.

985214891 is a deficient number, since it is larger than the sum of its proper divisors (1).

985214891 is an equidigital number, since it uses as much as digits as its factorization.

985214891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 985214891 is about 31388.1329645457. The cubic root of 985214891 is about 995.0471400105.

The spelling of 985214891 in words is "nine hundred eighty-five million, two hundred fourteen thousand, eight hundred ninety-one".