172348909 has 4 divisors (see below), whose sum is σ = 172378080. Its totient is φ = 172319740.

The previous prime is 172348889. The next prime is 172348961. The reversal of 172348909 is 909843271.

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: 909843271 = 1979 ⋅459749.

It is a cyclic number.

It is not a de Polignac number, because 172348909 - 2²³ = 163960301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172348009) 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, 2239 + ... + 18700.

It is an arithmetic number, because the mean of its divisors is an integer number (43094520).

Almost surely, 2^172348909 is an apocalyptic number.

It is an amenable number.

172348909 is a deficient number, since it is larger than the sum of its proper divisors (29171).

172348909 is an equidigital number, since it uses as much as digits as its factorization.

172348909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29170.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 172348909 is about 13128.1723404288. The cubic root of 172348909 is about 556.5055666265.

The spelling of 172348909 in words is "one hundred seventy-two million, three hundred forty-eight thousand, nine hundred nine".