64217231 has 4 divisors (see below), whose sum is σ = 69157032. Its totient is φ = 59277432.

The previous prime is 64217203. The next prime is 64217249. The reversal of 64217231 is 13271246.

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 64217231 - 2¹⁴ = 64200847 is a prime.

It is a super-2 number, since 2×64217231² = 8247705514614722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64217231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64217261) 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, 2469881 + ... + 2469906.

It is an arithmetic number, because the mean of its divisors is an integer number (17289258).

Almost surely, 2^64217231 is an apocalyptic number.

64217231 is a deficient number, since it is larger than the sum of its proper divisors (4939801).

64217231 is a wasteful number, since it uses less digits than its factorization.

64217231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4939800.

The product of its digits is 2016, while the sum is 26.

The square root of 64217231 is about 8013.5654361838. The cubic root of 64217231 is about 400.4520535099.

Adding to 64217231 its reverse (13271246), we get a palindrome (77488477).

The spelling of 64217231 in words is "sixty-four million, two hundred seventeen thousand, two hundred thirty-one".