9997827811 has 2 divisors, whose sum is σ = 9997827812. Its totient is φ = 9997827810.

The previous prime is 9997827781. The next prime is 9997827817. The reversal of 9997827811 is 1187287999.

It is a strong prime.

It is an emirp because it is prime and its reverse (1187287999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9997827811 - 2²³ = 9989439203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9997827811.

It is not a weakly prime, because it can be changed into another prime (9997827817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998913905 + 4998913906.

It is an arithmetic number, because the mean of its divisors is an integer number (4998913906).

Almost surely, 2^9997827811 is an apocalyptic number.

9997827811 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997827811 is an equidigital number, since it uses as much as digits as its factorization.

9997827811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 61.

The square root of 9997827811 is about 99989.1384651353. The cubic root of 9997827811 is about 2154.2786840910.

The spelling of 9997827811 in words is "nine billion, nine hundred ninety-seven million, eight hundred twenty-seven thousand, eight hundred eleven".