9990100999 has 2 divisors, whose sum is σ = 9990101000. Its totient is φ = 9990100998.

The previous prime is 9990100997. The next prime is 9990101039. The reversal of 9990100999 is 9990010999.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9990010999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9990100999 - 2¹ = 9990100997 is a prime.

Together with 9990100997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9990100993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995050499 + 4995050500.

It is an arithmetic number, because the mean of its divisors is an integer number (4995050500).

Almost surely, 2^9990100999 is an apocalyptic number.

9990100999 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990100999 is an equidigital number, since it uses as much as digits as its factorization.

9990100999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 531441, while the sum is 55.

The square root of 9990100999 is about 99950.4927401561. The cubic root of 9990100999 is about 2153.7235636272.

Multiplying 9990100999 by its sum of digits (55), we get a palindrome (549455554945).

Subtracting from 9990100999 its reverse (9990010999), we obtain a square (90000 = 300²).

The spelling of 9990100999 in words is "nine billion, nine hundred ninety million, one hundred thousand, nine hundred ninety-nine".