172505807 has 4 divisors (see below), whose sum is σ = 181585080. Its totient is φ = 163426536.

The previous prime is 172505779. The next prime is 172505821. The reversal of 172505807 is 708505271.

172505807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 708505271 = 23 ⋅30804577.

It is a cyclic number.

It is not a de Polignac number, because 172505807 - 2¹² = 172501711 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 (172505897) 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, 4539608 + ... + 4539645.

It is an arithmetic number, because the mean of its divisors is an integer number (45396270).

Almost surely, 2^172505807 is an apocalyptic number.

172505807 is a deficient number, since it is larger than the sum of its proper divisors (9079273).

172505807 is an equidigital number, since it uses as much as digits as its factorization.

172505807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9079272.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 172505807 is about 13134.1466034151. The cubic root of 172505807 is about 556.6743872061.

The spelling of 172505807 in words is "one hundred seventy-two million, five hundred five thousand, eight hundred seven".