990984193 has 4 divisors (see below), whose sum is σ = 991064068. Its totient is φ = 990904320.

The previous prime is 990984191. The next prime is 990984217. The reversal of 990984193 is 391489099.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 391489099 = 3331 ⋅117529.

It can be written as a sum of positive squares in 2 ways, for example, as 481714704 + 509269489 = 21948^2 + 22567^2 .

It is a cyclic number.

It is not a de Polignac number, because 990984193 - 2¹ = 990984191 is a prime.

It is a super-2 number, since 2×990984193² = 1964099341551722498, which contains 22 as substring.

It is a deceptive number, since it divides R_990984192.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990984193.

It is not an unprimeable number, because it can be changed into a prime (990984191) 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 in 3 ways as a sum of consecutive naturals, for example, 16896 + ... + 47617.

It is an arithmetic number, because the mean of its divisors is an integer number (247766017).

Almost surely, 2^990984193 is an apocalyptic number.

It is an amenable number.

990984193 is a deficient number, since it is larger than the sum of its proper divisors (79875).

990984193 is a wasteful number, since it uses less digits than its factorization.

990984193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79874.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 990984193 is about 31479.9014134416. The cubic root of 990984193 is about 996.9856538470.

The spelling of 990984193 in words is "nine hundred ninety million, nine hundred eighty-four thousand, one hundred ninety-three".