200128001 has 4 divisors (see below), whose sum is σ = 201453504. Its totient is φ = 198802500.

The previous prime is 200127989. The next prime is 200128003. The reversal of 200128001 is 100821002.

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: 100821002 = 2 ⋅50410501.

It is a cyclic number.

It is not a de Polignac number, because 200128001 - 2¹⁰ = 200126977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200128003) 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, 662525 + ... + 662826.

It is an arithmetic number, because the mean of its divisors is an integer number (50363376).

Almost surely, 2^200128001 is an apocalyptic number.

It is an amenable number.

200128001 is a deficient number, since it is larger than the sum of its proper divisors (1325503).

200128001 is a wasteful number, since it uses less digits than its factorization.

200128001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325502.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 200128001 is about 14146.6604186288. The cubic root of 200128001 is about 584.9282801014.

Adding to 200128001 its reverse (100821002), we get a palindrome (300949003).

The spelling of 200128001 in words is "two hundred million, one hundred twenty-eight thousand, one".