561629 has 4 divisors (see below), whose sum is σ = 594684. Its totient is φ = 528576.

The previous prime is 561607. The next prime is 561667. The reversal of 561629 is 926165.

561629 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: 926165 = 5 ⋅185233.

It can be written as a sum of positive squares in 2 ways, for example, as 158404 + 403225 = 398^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 561629 - 2⁸ = 561373 is a prime.

It is a Duffinian number.

561629 is a modest number, since divided by 629 gives 561 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561229) 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, 16502 + ... + 16535.

It is an arithmetic number, because the mean of its divisors is an integer number (148671).

2⁵⁶¹⁶²⁹ is an apocalyptic number.

It is an amenable number.

561629 is a deficient number, since it is larger than the sum of its proper divisors (33055).

561629 is a wasteful number, since it uses less digits than its factorization.

561629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33054.

The product of its digits is 3240, while the sum is 29.

The square root of 561629 is about 749.4191083766. The cubic root of 561629 is about 82.5055521210.

The spelling of 561629 in words is "five hundred sixty-one thousand, six hundred twenty-nine".