561953 has 4 divisors (see below), whose sum is σ = 642240. Its totient is φ = 481668.

The previous prime is 561947. The next prime is 561961. The reversal of 561953 is 359165.

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 561953 - 2¹⁰ = 560929 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40133 + ... + 40146.

It is an arithmetic number, because the mean of its divisors is an integer number (160560).

2⁵⁶¹⁹⁵³ is an apocalyptic number.

It is an amenable number.

561953 is a deficient number, since it is larger than the sum of its proper divisors (80287).

561953 is an equidigital number, since it uses as much as digits as its factorization.

561953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80286.

The product of its digits is 4050, while the sum is 29.

The square root of 561953 is about 749.6352446357. The cubic root of 561953 is about 82.5214147041.

The spelling of 561953 in words is "five hundred sixty-one thousand, nine hundred fifty-three".