561755 has 8 divisors (see below), whose sum is σ = 678192. Its totient is φ = 446688.

The previous prime is 561733. The next prime is 561761. The reversal of 561755 is 557165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561755 - 2¹⁴ = 545371 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1217 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (84774).

2⁵⁶¹⁷⁵⁵ is an apocalyptic number.

561755 is a deficient number, since it is larger than the sum of its proper divisors (116437).

561755 is a wasteful number, since it uses less digits than its factorization.

561755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685.

The product of its digits is 5250, while the sum is 29.

The square root of 561755 is about 749.5031687725. The cubic root of 561755 is about 82.5117216280.

It can be divided in two parts, 56175 and 5, that multiplied together give a triangular number (280875 = T₇₄₉).

The spelling of 561755 in words is "five hundred sixty-one thousand, seven hundred fifty-five".