990111001001000 has 32 divisors (see below), whose sum is σ = 2316859742344680. Its totient is φ = 396044400400000.

The previous prime is 990111001000951. The next prime is 990111001001011. The reversal of 990111001001000 is 100100111099.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 513100328351524 + 477010672649476 = 22651718^2 + 21840574^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495055499501 + ... + 495055501500.

Almost surely, 2^{990111001001000} is an apocalyptic number.

It is an amenable number.

990111001001000 is an abundant number, since it is smaller than the sum of its proper divisors (1326748741343680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

990111001001000 is a wasteful number, since it uses less digits than its factorization.

990111001001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990111001022 (or 990111001008 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 23.

Adding to 990111001001000 its reverse (100100111099), we get a palindrome (990211101112099).

The spelling of 990111001001000 in words is "nine hundred ninety trillion, one hundred eleven billion, one million, one thousand".