65643231 has 8 divisors (see below), whose sum is σ = 87725440. Its totient is φ = 43661592.

The previous prime is 65643229. The next prime is 65643257. The reversal of 65643231 is 13234656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65643231 - 2¹ = 65643229 is a prime.

It is a super-2 number, since 2×65643231² = 8618067552238722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65643131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23605 + ... + 26238.

It is an arithmetic number, because the mean of its divisors is an integer number (10965680).

Almost surely, 2^65643231 is an apocalyptic number.

65643231 is a deficient number, since it is larger than the sum of its proper divisors (22082209).

65643231 is a wasteful number, since it uses less digits than its factorization.

65643231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50285.

The product of its digits is 12960, while the sum is 30.

The square root of 65643231 is about 8102.0510366203. The cubic root of 65643231 is about 403.3945096893.

Adding to 65643231 its reverse (13234656), we get a palindrome (78877887).

The spelling of 65643231 in words is "sixty-five million, six hundred forty-three thousand, two hundred thirty-one".