9939691249 has 2 divisors, whose sum is σ = 9939691250. Its totient is φ = 9939691248.

The previous prime is 9939691243. The next prime is 9939691259. The reversal of 9939691249 is 9421969399.

9939691249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9273690000 + 666001249 = 96300^2 + 25807^2 .

It is a cyclic number.

It is not a de Polignac number, because 9939691249 - 2²⁵ = 9906136817 is a prime.

It is not a weakly prime, because it can be changed into another prime (9939691243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4969845624 + 4969845625.

It is an arithmetic number, because the mean of its divisors is an integer number (4969845625).

Almost surely, 2^9939691249 is an apocalyptic number.

It is an amenable number.

9939691249 is a deficient number, since it is larger than the sum of its proper divisors (1).

9939691249 is an equidigital number, since it uses as much as digits as its factorization.

9939691249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8503056, while the sum is 61.

The square root of 9939691249 is about 99698.0002256816. Note that the first 3 decimals coincide. The cubic root of 9939691249 is about 2150.0949119088.

The spelling of 9939691249 in words is "nine billion, nine hundred thirty-nine million, six hundred ninety-one thousand, two hundred forty-nine".