172124545 has 4 divisors (see below), whose sum is σ = 206549460. Its totient is φ = 137699632.

The previous prime is 172124543. The next prime is 172124551. The reversal of 172124545 is 545421271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545421271 = 3331 ⋅163741.

It can be written as a sum of positive squares in 2 ways, for example, as 60357361 + 111767184 = 7769^2 + 10572^2 .

It is a cyclic number.

It is not a de Polignac number, because 172124545 - 2¹ = 172124543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172124543) 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, 17212450 + ... + 17212459.

It is an arithmetic number, because the mean of its divisors is an integer number (51637365).

Almost surely, 2^172124545 is an apocalyptic number.

It is an amenable number.

172124545 is a deficient number, since it is larger than the sum of its proper divisors (34424915).

172124545 is an equidigital number, since it uses as much as digits as its factorization.

172124545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34424914.

The product of its digits is 11200, while the sum is 31.

The square root of 172124545 is about 13119.6244229780. The cubic root of 172124545 is about 556.2639752412.

The spelling of 172124545 in words is "one hundred seventy-two million, one hundred twenty-four thousand, five hundred forty-five".