9110805721 has 2 divisors, whose sum is σ = 9110805722. Its totient is φ = 9110805720.

The previous prime is 9110805689. The next prime is 9110805749. The reversal of 9110805721 is 1275080119.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8546078025 + 564727696 = 92445^2 + 23764^2 .

It is an emirp because it is prime and its reverse (1275080119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9110805721 - 2⁵ = 9110805689 is a prime.

It is not a weakly prime, because it can be changed into another prime (9110805521) 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, 4555402860 + 4555402861.

It is an arithmetic number, because the mean of its divisors is an integer number (4555402861).

Almost surely, 2^9110805721 is an apocalyptic number.

It is an amenable number.

9110805721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9110805721 is an equidigital number, since it uses as much as digits as its factorization.

9110805721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 9110805721 is about 95450.5407056450. The cubic root of 9110805721 is about 2088.5855161310.

The spelling of 9110805721 in words is "nine billion, one hundred ten million, eight hundred five thousand, seven hundred twenty-one".