172563971 has 4 divisors (see below), whose sum is σ = 172608000. Its totient is φ = 172519944.

The previous prime is 172563961. The next prime is 172563973. The reversal of 172563971 is 179365271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 179365271 = 1621 ⋅110651.

It is a cyclic number.

It is not a de Polignac number, because 172563971 - 2⁶ = 172563907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172563973) 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, 15491 + ... + 24188.

It is an arithmetic number, because the mean of its divisors is an integer number (43152000).

Almost surely, 2^172563971 is an apocalyptic number.

172563971 is a deficient number, since it is larger than the sum of its proper divisors (44029).

172563971 is an equidigital number, since it uses as much as digits as its factorization.

172563971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44028.

The product of its digits is 79380, while the sum is 41.

The square root of 172563971 is about 13136.3606451711. The cubic root of 172563971 is about 556.7369450436.

The spelling of 172563971 in words is "one hundred seventy-two million, five hundred sixty-three thousand, nine hundred seventy-one".