617561 has 4 divisors (see below), whose sum is σ = 705792. Its totient is φ = 529332.

The previous prime is 617537. The next prime is 617579. The reversal of 617561 is 165716.

617561 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 617561 - 2¹⁰ = 616537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 617561.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 617561.

It is not an unprimeable number, because it can be changed into a prime (617521) 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, 44105 + ... + 44118.

It is an arithmetic number, because the mean of its divisors is an integer number (176448).

2⁶¹⁷⁵⁶¹ is an apocalyptic number.

It is an amenable number.

617561 is a deficient number, since it is larger than the sum of its proper divisors (88231).

617561 is an equidigital number, since it uses as much as digits as its factorization.

617561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88230.

The product of its digits is 1260, while the sum is 26.

The square root of 617561 is about 785.8504946871. The cubic root of 617561 is about 85.1582289162.

The spelling of 617561 in words is "six hundred seventeen thousand, five hundred sixty-one".