864172563 has 4 divisors (see below), whose sum is σ = 1152230088. Its totient is φ = 576115040.

The previous prime is 864172493. The next prime is 864172567. The reversal of 864172563 is 365271468.

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 864172563 - 2¹⁷ = 864041491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (864172567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144028758 + ... + 144028763.

It is an arithmetic number, because the mean of its divisors is an integer number (288057522).

Almost surely, 2^864172563 is an apocalyptic number.

864172563 is a deficient number, since it is larger than the sum of its proper divisors (288057525).

864172563 is a wasteful number, since it uses less digits than its factorization.

864172563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288057524.

The product of its digits is 241920, while the sum is 42.

The square root of 864172563 is about 29396.8121230857. The cubic root of 864172563 is about 952.5040359154.

The spelling of 864172563 in words is "eight hundred sixty-four million, one hundred seventy-two thousand, five hundred sixty-three".