990999999403 has 2 divisors, whose sum is σ = 990999999404. Its totient is φ = 990999999402.

The previous prime is 990999999391. The next prime is 990999999463. The reversal of 990999999403 is 304999999099.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (304999999099) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990999999403 is a prime.

It is not a weakly prime, because it can be changed into another prime (990999999463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495499999701 + 495499999702.

It is an arithmetic number, because the mean of its divisors is an integer number (495499999702).

Almost surely, 2^990999999403 is an apocalyptic number.

990999999403 is a deficient number, since it is larger than the sum of its proper divisors (1).

990999999403 is an equidigital number, since it uses as much as digits as its factorization.

990999999403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516560652, while the sum is 79.

The spelling of 990999999403 in words is "nine hundred ninety billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred three".