172045001 has 4 divisors (see below), whose sum is σ = 172074132. Its totient is φ = 172015872.

The previous prime is 172044959. The next prime is 172045007. The reversal of 172045001 is 100540271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100540271 = 13 ⋅7733867.

It can be written as a sum of positive squares in 2 ways, for example, as 65934400 + 106110601 = 8120^2 + 10301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172045001 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 (172045007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2216 + ... + 18681.

It is an arithmetic number, because the mean of its divisors is an integer number (43018533).

Almost surely, 2^172045001 is an apocalyptic number.

It is an amenable number.

172045001 is a deficient number, since it is larger than the sum of its proper divisors (29131).

172045001 is an equidigital number, since it uses as much as digits as its factorization.

172045001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29130.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 172045001 is about 13116.5925834418. The cubic root of 172045001 is about 556.1782731905.

Adding to 172045001 its reverse (100540271), we get a palindrome (272585272).

The spelling of 172045001 in words is "one hundred seventy-two million, forty-five thousand, one".