990199011002 has 4 divisors (see below), whose sum is σ = 1485298516506. Its totient is φ = 495099505500.

The previous prime is 990199011001. The next prime is 990199011029. The reversal of 990199011002 is 200110991099.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 200110991099 = 112583 ⋅1777453.

It can be written as a sum of positive squares in only one way, i.e., 895883073121 + 94315937881 = 946511^2 + 307109^2 .

It is not an unprimeable number, because it can be changed into a prime (990199011001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247549752749 + ... + 247549752752.

Almost surely, 2^990199011002 is an apocalyptic number.

990199011002 is a deficient number, since it is larger than the sum of its proper divisors (495099505504).

990199011002 is a wasteful number, since it uses less digits than its factorization.

990199011002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495099505503.

The product of its (nonzero) digits is 13122, while the sum is 41.

The spelling of 990199011002 in words is "nine hundred ninety billion, one hundred ninety-nine million, eleven thousand, two".