9923398249 has 2 divisors, whose sum is σ = 9923398250. Its totient is φ = 9923398248.

The previous prime is 9923398211. The next prime is 9923398267. The reversal of 9923398249 is 9428933299.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6059532649 + 3863865600 = 77843^2 + 62160^2 .

It is a cyclic number.

It is not a de Polignac number, because 9923398249 - 2¹¹ = 9923396201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9923398193 and 9923398202.

It is not a weakly prime, because it can be changed into another prime (9923398279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4961699124 + 4961699125.

It is an arithmetic number, because the mean of its divisors is an integer number (4961699125).

Almost surely, 2^9923398249 is an apocalyptic number.

It is an amenable number.

9923398249 is a deficient number, since it is larger than the sum of its proper divisors (1).

9923398249 is an equidigital number, since it uses as much as digits as its factorization.

9923398249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7558272, while the sum is 58.

The square root of 9923398249 is about 99616.2549436587. The cubic root of 9923398249 is about 2148.9194677891.

The spelling of 9923398249 in words is "nine billion, nine hundred twenty-three million, three hundred ninety-eight thousand, two hundred forty-nine".