613657 has 4 divisors (see below), whose sum is σ = 669456. Its totient is φ = 557860.

The previous prime is 613651. The next prime is 613661. The reversal of 613657 is 756316.

613657 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 613657 - 2¹⁵ = 580889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613651) 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, 27883 + ... + 27904.

It is an arithmetic number, because the mean of its divisors is an integer number (167364).

2⁶¹³⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

613657 is a deficient number, since it is larger than the sum of its proper divisors (55799).

613657 is a wasteful number, since it uses less digits than its factorization.

613657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55798.

The product of its digits is 3780, while the sum is 28.

The square root of 613657 is about 783.3626235659. The cubic root of 613657 is about 84.9784028175.

The spelling of 613657 in words is "six hundred thirteen thousand, six hundred fifty-seven".