1899900002001 has 4 divisors (see below), whose sum is σ = 2533200002672. Its totient is φ = 1266600001332.

The previous prime is 1899900001957. The next prime is 1899900002003. The reversal of 1899900002001 is 1002000099981.

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.

It is not a de Polignac number, because 1899900002001 - 2³¹ = 1897752518353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1899900002003) 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, 316650000331 + ... + 316650000336.

It is an arithmetic number, because the mean of its divisors is an integer number (633300000668).

Almost surely, 2^{1899900002001} is an apocalyptic number.

It is an amenable number.

1899900002001 is a deficient number, since it is larger than the sum of its proper divisors (633300000671).

1899900002001 is an equidigital number, since it uses as much as digits as its factorization.

1899900002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633300000670.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 1899900002001 in words is "one trillion, eight hundred ninety-nine billion, nine hundred million, two thousand, one".