172515073 has 4 divisors (see below), whose sum is σ = 172965888. Its totient is φ = 172064260.

The previous prime is 172515071. The next prime is 172515103. The reversal of 172515073 is 370515271.

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: 370515271 = 7 ⋅52930753.

It is a cyclic number.

It is not a de Polignac number, because 172515073 - 2¹ = 172515071 is a prime.

It is a super-2 number, since 2×172515073² = 59522900824390658, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172515071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224833 + ... + 225598.

It is an arithmetic number, because the mean of its divisors is an integer number (43241472).

Almost surely, 2^172515073 is an apocalyptic number.

It is an amenable number.

172515073 is a deficient number, since it is larger than the sum of its proper divisors (450815).

172515073 is an equidigital number, since it uses as much as digits as its factorization.

172515073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450814.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 172515073 is about 13134.4993433324. The cubic root of 172515073 is about 556.6843541218.

The spelling of 172515073 in words is "one hundred seventy-two million, five hundred fifteen thousand, seventy-three".