613649 has 4 divisors (see below), whose sum is σ = 649764. Its totient is φ = 577536.

The previous prime is 613637. The next prime is 613651. The reversal of 613649 is 946316.

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 283024 + 330625 = 532^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 613649 - 2⁴ = 613633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 613649.

It is not an unprimeable number, because it can be changed into a prime (613609) 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, 18032 + ... + 18065.

It is an arithmetic number, because the mean of its divisors is an integer number (162441).

2⁶¹³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

613649 is a deficient number, since it is larger than the sum of its proper divisors (36115).

613649 is a wasteful number, since it uses less digits than its factorization.

613649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36114.

The product of its digits is 3888, while the sum is 29.

The square root of 613649 is about 783.3575173572. The cubic root of 613649 is about 84.9780335394.

The spelling of 613649 in words is "six hundred thirteen thousand, six hundred forty-nine".