613505 has 4 divisors (see below), whose sum is σ = 736212. Its totient is φ = 490800.

The previous prime is 613499. The next prime is 613507. The reversal of 613505 is 505316.

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

It can be written as a sum of positive squares in 2 ways, for example, as 446224 + 167281 = 668^2 + 409^2 .

It is not a de Polignac number, because 613505 - 2⁶ = 613441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613507) 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, 61346 + ... + 61355.

It is an arithmetic number, because the mean of its divisors is an integer number (184053).

2⁶¹³⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

613505 is a deficient number, since it is larger than the sum of its proper divisors (122707).

613505 is a wasteful number, since it uses less digits than its factorization.

613505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122706.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 613505 is about 783.2655999085. The cubic root of 613505 is about 84.9713859857.

The spelling of 613505 in words is "six hundred thirteen thousand, five hundred five".