172438971 has 4 divisors (see below), whose sum is σ = 229918632. Its totient is φ = 114959312.

The previous prime is 172438969. The next prime is 172438979. The reversal of 172438971 is 179834271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 179834271 = 3 ⋅59944757.

It is a cyclic number.

It is not a de Polignac number, because 172438971 - 2¹ = 172438969 is a prime.

It is a super-3 number, since 3×172438971³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (172438979) 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, 28739826 + ... + 28739831.

It is an arithmetic number, because the mean of its divisors is an integer number (57479658).

Almost surely, 2^172438971 is an apocalyptic number.

172438971 is a deficient number, since it is larger than the sum of its proper divisors (57479661).

172438971 is an equidigital number, since it uses as much as digits as its factorization.

172438971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57479660.

The product of its digits is 84672, while the sum is 42.

The square root of 172438971 is about 13131.6019967101. The cubic root of 172438971 is about 556.6024849012.

The spelling of 172438971 in words is "one hundred seventy-two million, four hundred thirty-eight thousand, nine hundred seventy-one".