561653 has 4 divisors (see below), whose sum is σ = 563340. Its totient is φ = 559968.

The previous prime is 561607. The next prime is 561667. The reversal of 561653 is 356165.

561653 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 an emirpimes, since its reverse is a distinct semiprime: 356165 = 5 ⋅71233.

It can be written as a sum of positive squares in 2 ways, for example, as 528529 + 33124 = 727^2 + 182^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561053) 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, 158 + ... + 1071.

It is an arithmetic number, because the mean of its divisors is an integer number (140835).

2⁵⁶¹⁶⁵³ is an apocalyptic number.

It is an amenable number.

561653 is a deficient number, since it is larger than the sum of its proper divisors (1687).

561653 is a wasteful number, since it uses less digits than its factorization.

561653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686.

The product of its digits is 2700, while the sum is 26.

The square root of 561653 is about 749.4351206075. The cubic root of 561653 is about 82.5067273363.

The spelling of 561653 in words is "five hundred sixty-one thousand, six hundred fifty-three".