9990099901 has 4 divisors (see below), whose sum is σ = 10005932704. Its totient is φ = 9974267100.

The previous prime is 9990099877. The next prime is 9990099907. The reversal of 9990099901 is 1099900999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1099900999 = 43 ⋅25579093.

It is a cyclic number.

It is not a de Polignac number, because 9990099901 - 2²¹ = 9988002749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990099907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7915455 + ... + 7916716.

It is an arithmetic number, because the mean of its divisors is an integer number (2501483176).

Almost surely, 2^9990099901 is an apocalyptic number.

It is an amenable number.

9990099901 is a deficient number, since it is larger than the sum of its proper divisors (15832803).

9990099901 is a wasteful number, since it uses less digits than its factorization.

9990099901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15832802.

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

The square root of 9990099901 is about 99950.4872474367. The cubic root of 9990099901 is about 2153.7234847228.

It can be divided in two parts, 999009 and 9901, that added together give a triangular number (1008910 = T₁₄₂₀).

The spelling of 9990099901 in words is "nine billion, nine hundred ninety million, ninety-nine thousand, nine hundred one".