990912913 has 2 divisors, whose sum is σ = 990912914. Its totient is φ = 990912912.

The previous prime is 990912911. The next prime is 990912929. The reversal of 990912913 is 319219099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 844309249 + 146603664 = 29057^2 + 12108^2 .

It is an emirp because it is prime and its reverse (319219099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990912913 - 2¹ = 990912911 is a prime.

Together with 990912911, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 990912913.

It is not a weakly prime, because it can be changed into another prime (990912911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495456456 + 495456457.

It is an arithmetic number, because the mean of its divisors is an integer number (495456457).

Almost surely, 2^990912913 is an apocalyptic number.

It is an amenable number.

990912913 is a deficient number, since it is larger than the sum of its proper divisors (1).

990912913 is an equidigital number, since it uses as much as digits as its factorization.

990912913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 990912913 is about 31478.7692421416. The cubic root of 990912913 is about 996.9617493818.

It can be divided in two parts, 9909 and 12913, that added together give a palindrome (22822).

The spelling of 990912913 in words is "nine hundred ninety million, nine hundred twelve thousand, nine hundred thirteen".