990999789239 has 2 divisors, whose sum is σ = 990999789240. Its totient is φ = 990999789238.

The previous prime is 990999789229. The next prime is 990999789317. The reversal of 990999789239 is 932987999099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990999789239 - 2¹² = 990999785143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990999789229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495499894619 + 495499894620.

It is an arithmetic number, because the mean of its divisors is an integer number (495499894620).

Almost surely, 2^990999789239 is an apocalyptic number.

990999789239 is a deficient number, since it is larger than the sum of its proper divisors (1).

990999789239 is an equidigital number, since it uses as much as digits as its factorization.

990999789239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1607077584, while the sum is 83.

The spelling of 990999789239 in words is "nine hundred ninety billion, nine hundred ninety-nine million, seven hundred eighty-nine thousand, two hundred thirty-nine".