201123001 has 8 divisors (see below), whose sum is σ = 205488360. Its totient is φ = 196804608.

The previous prime is 201122989. The next prime is 201123059. The reversal of 201123001 is 100321102.

It can be written as a sum of positive squares in 4 ways, for example, as 164025 + 200958976 = 405^2 + 14176^2 .

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 201123001 - 2⁹ = 201122489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201123061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3016 + ... + 20281.

It is an arithmetic number, because the mean of its divisors is an integer number (25686045).

Almost surely, 2^201123001 is an apocalyptic number.

It is an amenable number.

201123001 is a deficient number, since it is larger than the sum of its proper divisors (4365359).

201123001 is an equidigital number, since it uses as much as digits as its factorization.

201123001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23483.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 201123001 is about 14181.7841261246. The cubic root of 201123001 is about 585.8960636407.

Adding to 201123001 its reverse (100321102), we get a palindrome (301444103).

The spelling of 201123001 in words is "two hundred one million, one hundred twenty-three thousand, one".