613643 has 4 divisors (see below), whose sum is σ = 645960. Its totient is φ = 581328.

The previous prime is 613637. The next prime is 613651. The reversal of 613643 is 346316.

613643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-613643 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 613643.

It is not an unprimeable number, because it can be changed into a prime (613633) 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, 16130 + ... + 16167.

It is an arithmetic number, because the mean of its divisors is an integer number (161490).

2⁶¹³⁶⁴³ is an apocalyptic number.

613643 is a deficient number, since it is larger than the sum of its proper divisors (32317).

613643 is a wasteful number, since it uses less digits than its factorization.

613643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32316.

The product of its digits is 1296, while the sum is 23.

The square root of 613643 is about 783.3536876788. The cubic root of 613643 is about 84.9777565788.

Adding to 613643 its reverse (346316), we get a palindrome (959959).

The spelling of 613643 in words is "six hundred thirteen thousand, six hundred forty-three".