613945 has 4 divisors (see below), whose sum is σ = 736740. Its totient is φ = 491152.

The previous prime is 613903. The next prime is 613957. The reversal of 613945 is 549316.

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 466489 + 147456 = 683^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 613945 - 2⁷ = 613817 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61390 + ... + 61399.

It is an arithmetic number, because the mean of its divisors is an integer number (184185).

2⁶¹³⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

613945 is a deficient number, since it is larger than the sum of its proper divisors (122795).

613945 is a wasteful number, since it uses less digits than its factorization.

613945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122794.

The product of its digits is 3240, while the sum is 28.

The square root of 613945 is about 783.5464249169. The cubic root of 613945 is about 84.9916946902.

The spelling of 613945 in words is "six hundred thirteen thousand, nine hundred forty-five".