8663531 has 4 divisors (see below), whose sum is σ = 8684064. Its totient is φ = 8643000.

The previous prime is 8663521. The next prime is 8663537. The reversal of 8663531 is 1353668.

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 8663531 - 2⁶ = 8663467 is a prime.

It is a super-2 number, since 2×8663531² = 150113538775922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8663537) 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, 9620 + ... + 10481.

It is an arithmetic number, because the mean of its divisors is an integer number (2171016).

Almost surely, 2^8663531 is an apocalyptic number.

8663531 is a deficient number, since it is larger than the sum of its proper divisors (20533).

8663531 is a wasteful number, since it uses less digits than its factorization.

8663531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20532.

The product of its digits is 12960, while the sum is 32.

The square root of 8663531 is about 2943.3876740926. The cubic root of 8663531 is about 205.3832292046.

The spelling of 8663531 in words is "eight million, six hundred sixty-three thousand, five hundred thirty-one".