64531 has 4 divisors (see below), whose sum is σ = 65952.
Its totient is φ = 63112.
The previous prime is 64513. The next prime is 64553. The reversal of 64531 is 13546.
It can be divided in two parts, 645 and 31, that added together give a palindrome (676).
64531 is nontrivially palindromic in base 3.
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 64531 - 25 = 64499 is a prime.
It is a super-2 number, since 2×645312 = 8328499922, which contains 22 as substring.
It is a Duffinian number.
It is a plaindrome in base 13.
It is a junction number, because it is equal to n+sod(n) for n = 64499 and 64508.
It is not an unprimeable number, because it can be changed into a prime (64591) 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, 640 + ... + 733.
It is an arithmetic number, because the mean of its divisors is an integer number (16488).
264531 is an apocalyptic number.
64531 is a deficient number, since it is larger than the sum of its proper divisors (1421).
64531 is a wasteful number, since it uses less digits than its factorization.
64531 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1420.
The product of its digits is 360, while the sum is 19.
The square root of 64531 is about 254.0295258430.
The cubic root of 64531 is about 40.1103204552.
The spelling of 64531 in words is "sixty-four thousand, five hundred thirty-one".