990839197 has 2 divisors, whose sum is σ = 990839198. Its totient is φ = 990839196.

The previous prime is 990839191. The next prime is 990839219. The reversal of 990839197 is 791938099.

990839197 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., 731918916 + 258920281 = 27054^2 + 16091^2 .

It is a cyclic number.

It is not a de Polignac number, because 990839197 - 2¹¹ = 990837149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990839191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495419598 + 495419599.

It is an arithmetic number, because the mean of its divisors is an integer number (495419599).

Almost surely, 2^990839197 is an apocalyptic number.

It is an amenable number.

990839197 is a deficient number, since it is larger than the sum of its proper divisors (1).

990839197 is an equidigital number, since it uses as much as digits as its factorization.

990839197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The square root of 990839197 is about 31477.5983359595. The cubic root of 990839197 is about 996.9370267738.

The spelling of 990839197 in words is "nine hundred ninety million, eight hundred thirty-nine thousand, one hundred ninety-seven".