990881219 has 2 divisors, whose sum is σ = 990881220. Its totient is φ = 990881218.

The previous prime is 990881209. The next prime is 990881257. The reversal of 990881219 is 912188099.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990881219 is a prime.

It is a super-2 number, since 2×990881219² = 1963691180333851922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (990881209) 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, 495440609 + 495440610.

It is an arithmetic number, because the mean of its divisors is an integer number (495440610).

Almost surely, 2^990881219 is an apocalyptic number.

990881219 is a deficient number, since it is larger than the sum of its proper divisors (1).

990881219 is an equidigital number, since it uses as much as digits as its factorization.

990881219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 47.

The square root of 990881219 is about 31478.2658194507. The cubic root of 990881219 is about 996.9511201119.

The spelling of 990881219 in words is "nine hundred ninety million, eight hundred eighty-one thousand, two hundred nineteen".