9923349991 has 2 divisors, whose sum is σ = 9923349992. Its totient is φ = 9923349990.

The previous prime is 9923349979. The next prime is 9923350033. The reversal of 9923349991 is 1999433299.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9923349991 - 2⁹ = 9923349479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9923349941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4961674995 + 4961674996.

It is an arithmetic number, because the mean of its divisors is an integer number (4961674996).

Almost surely, 2^9923349991 is an apocalyptic number.

9923349991 is a deficient number, since it is larger than the sum of its proper divisors (1).

9923349991 is an equidigital number, since it uses as much as digits as its factorization.

9923349991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4251528, while the sum is 58.

The square root of 9923349991 is about 99616.0127238588. The cubic root of 9923349991 is about 2148.9159843478.

The spelling of 9923349991 in words is "nine billion, nine hundred twenty-three million, three hundred forty-nine thousand, nine hundred ninety-one".