189090001 has 3 divisors (see below), whose sum is σ = 189103753.
Its totient is φ = 189076250.
The previous prime is 189089993. The next prime is 189090007. The reversal of 189090001 is 100090981.
The square root of 189090001 is 13751.
It is a perfect power (a square), and thus also a powerful number.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It is not a de Polignac number, because 189090001 - 23 = 189089993 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (189090007) by changing a digit.
It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6876 + ... + 20626.
Almost surely, 2189090001 is an apocalyptic number.
189090001 is the 13751-st square number.
189090001 is the 6876-th centered octagonal number.
It is an amenable number.
189090001 is a deficient number, since it is larger than the sum of its proper divisors (13752).
189090001 is an frugal number, since it uses more digits than its factorization.
189090001 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 27502 (or 13751 counting only the distinct ones).
The product of its (nonzero) digits is 648, while the sum is 28.
The cubic root of 189090001 is about 573.9704333494.
The spelling of 189090001 in words is "one hundred eighty-nine million, ninety thousand, one".