64517231 has 16 divisors (see below), whose sum is σ = 71221248. Its totient is φ = 58238400.

The previous prime is 64517213. The next prime is 64517249. The reversal of 64517231 is 13271546.

It is an interprime number because it is at equal distance from previous prime (64517213) and next prime (64517249).

It is a cyclic number.

It is not a de Polignac number, because 64517231 - 2¹⁴ = 64500847 is a prime.

It is a super-2 number, since 2×64517231² = 8324946191814722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64517194 and 64517203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64517251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28130 + ... + 30336.

It is an arithmetic number, because the mean of its divisors is an integer number (4451328).

Almost surely, 2^64517231 is an apocalyptic number.

64517231 is a deficient number, since it is larger than the sum of its proper divisors (6704017).

64517231 is a wasteful number, since it uses less digits than its factorization.

64517231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302.

The product of its digits is 5040, while the sum is 29.

The square root of 64517231 is about 8032.2618856708. The cubic root of 64517231 is about 401.0746746834.

Adding to 64517231 its reverse (13271546), we get a palindrome (77788777).

The spelling of 64517231 in words is "sixty-four million, five hundred seventeen thousand, two hundred thirty-one".