9910815749 has 2 divisors, whose sum is σ = 9910815750. Its totient is φ = 9910815748.

The previous prime is 9910815721. The next prime is 9910815757. The reversal of 9910815749 is 9475180199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9891297025 + 19518724 = 99455^2 + 4418^2 .

It is an emirp because it is prime and its reverse (9475180199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9910815749 - 2⁸ = 9910815493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9910815749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9910815709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4955407874 + 4955407875.

It is an arithmetic number, because the mean of its divisors is an integer number (4955407875).

Almost surely, 2^9910815749 is an apocalyptic number.

It is an amenable number.

9910815749 is a deficient number, since it is larger than the sum of its proper divisors (1).

9910815749 is an equidigital number, since it uses as much as digits as its factorization.

9910815749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 53.

The square root of 9910815749 is about 99553.0800578264. The cubic root of 9910815749 is about 2148.0108336486.

The spelling of 9910815749 in words is "nine billion, nine hundred ten million, eight hundred fifteen thousand, seven hundred forty-nine".