172001305 has 16 divisors (see below), whose sum is σ = 236937600. Its totient is φ = 117418752.

The previous prime is 172001293. The next prime is 172001309. The reversal of 172001305 is 503100271.

It is a cyclic number.

It is not a de Polignac number, because 172001305 - 2⁷ = 172001177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172001309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2880 + ... + 18769.

It is an arithmetic number, because the mean of its divisors is an integer number (14808600).

Almost surely, 2^172001305 is an apocalyptic number.

It is an amenable number.

172001305 is a deficient number, since it is larger than the sum of its proper divisors (64936295).

172001305 is a wasteful number, since it uses less digits than its factorization.

172001305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21888.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 172001305 is about 13114.9268011682. The cubic root of 172001305 is about 556.1311831396.

Adding to 172001305 its reverse (503100271), we get a palindrome (675101576).

The spelling of 172001305 in words is "one hundred seventy-two million, one thousand, three hundred five".