513644 has 6 divisors (see below), whose sum is σ = 898884. Its totient is φ = 256820.

The previous prime is 513641. The next prime is 513649. The reversal of 513644 is 446315.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (513641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64202 + ... + 64209.

It is an arithmetic number, because the mean of its divisors is an integer number (149814).

2⁵¹³⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

513644 is a deficient number, since it is larger than the sum of its proper divisors (385240).

513644 is a wasteful number, since it uses less digits than its factorization.

513644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128415 (or 128413 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 513644 is about 716.6896120358. The cubic root of 513644 is about 80.0855335176.

Adding to 513644 its reverse (446315), we get a palindrome (959959).

The spelling of 513644 in words is "five hundred thirteen thousand, six hundred forty-four".