172457609 has 4 divisors (see below), whose sum is σ = 174820116. Its totient is φ = 170095104.

The previous prime is 172457599. The next prime is 172457627. The reversal of 172457609 is 906754271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 150601984 + 21855625 = 12272^2 + 4675^2 .

It is a cyclic number.

It is not a de Polignac number, because 172457609 - 2²⁰ = 171409033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172457689) 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, 1181144 + ... + 1181289.

It is an arithmetic number, because the mean of its divisors is an integer number (43705029).

Almost surely, 2^172457609 is an apocalyptic number.

It is an amenable number.

172457609 is a deficient number, since it is larger than the sum of its proper divisors (2362507).

172457609 is an equidigital number, since it uses as much as digits as its factorization.

172457609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362506.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 172457609 is about 13132.3116396162. The cubic root of 172457609 is about 556.6225375674.

The spelling of 172457609 in words is "one hundred seventy-two million, four hundred fifty-seven thousand, six hundred nine".