172871015 has 4 divisors (see below), whose sum is σ = 207445224. Its totient is φ = 138296808.

The previous prime is 172870981. The next prime is 172871021. The reversal of 172871015 is 510178271.

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

It is a cyclic number.

It is not a de Polignac number, because 172871015 - 2²⁴ = 156093799 is a prime.

It is a super-3 number, since 3×172871015³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17287097 + ... + 17287106.

It is an arithmetic number, because the mean of its divisors is an integer number (51861306).

Almost surely, 2^172871015 is an apocalyptic number.

172871015 is a deficient number, since it is larger than the sum of its proper divisors (34574209).

172871015 is an equidigital number, since it uses as much as digits as its factorization.

172871015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34574208.

The product of its (nonzero) digits is 3920, while the sum is 32.

The square root of 172871015 is about 13148.0422497039. The cubic root of 172871015 is about 557.0669510721.

The spelling of 172871015 in words is "one hundred seventy-two million, eight hundred seventy-one thousand, fifteen".