985991291 has 2 divisors, whose sum is σ = 985991292. Its totient is φ = 985991290.

The previous prime is 985991287. The next prime is 985991299. The reversal of 985991291 is 192199589.

985991291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (192199589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 985991291 - 2² = 985991287 is a prime.

It is not a weakly prime, because it can be changed into another prime (985991299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492995645 + 492995646.

It is an arithmetic number, because the mean of its divisors is an integer number (492995646).

Almost surely, 2^985991291 is an apocalyptic number.

985991291 is a deficient number, since it is larger than the sum of its proper divisors (1).

985991291 is an equidigital number, since it uses as much as digits as its factorization.

985991291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 53.

The square root of 985991291 is about 31400.4982603780. The cubic root of 985991291 is about 995.3084541521.

The spelling of 985991291 in words is "nine hundred eighty-five million, nine hundred ninety-one thousand, two hundred ninety-one".