189990002001 has 4 divisors (see below), whose sum is σ = 253320002672. Its totient is φ = 126660001332.

The previous prime is 189990001921. The next prime is 189990002009. The reversal of 189990002001 is 100200099981.

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: 100200099981 = 3 ⋅33400033327.

It is not a de Polignac number, because 189990002001 - 2¹⁴ = 189989985617 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 (189990002009) 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, 31665000331 + ... + 31665000336.

It is an arithmetic number, because the mean of its divisors is an integer number (63330000668).

Almost surely, 2^189990002001 is an apocalyptic number.

It is an amenable number.

189990002001 is a deficient number, since it is larger than the sum of its proper divisors (63330000671).

189990002001 is an equidigital number, since it uses as much as digits as its factorization.

189990002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63330000670.

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

The spelling of 189990002001 in words is "one hundred eighty-nine billion, nine hundred ninety million, two thousand, one".