1990900000001 has 8 divisors (see below), whose sum is σ = 2173316988384. Its totient is φ = 1808720691520.

The previous prime is 1990899999983. The next prime is 1990900000039. The reversal of 1990900000001 is 1000000090991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1990900000001 - 2²² = 1990895805697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1990900000001.

It is not an unprimeable number, because it can be changed into a prime (1990900005001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59402456 + ... + 59435961.

It is an arithmetic number, because the mean of its divisors is an integer number (271664623548).

Almost surely, 2^{1990900000001} is an apocalyptic number.

1990900000001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1990900000001 is a deficient number, since it is larger than the sum of its proper divisors (182416988383).

1990900000001 is a wasteful number, since it uses less digits than its factorization.

1990900000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118839951.

The product of its (nonzero) digits is 729, while the sum is 29.

Adding to 1990900000001 its reverse (1000000090991), we get a palindrome (2990900090992).

The spelling of 1990900000001 in words is "one trillion, nine hundred ninety billion, nine hundred million, one", and thus it is an aban number.