561945 has 8 divisors (see below), whose sum is σ = 899136. Its totient is φ = 299696.

The previous prime is 561943. The next prime is 561947. The reversal of 561945 is 549165.

561945 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (561943) and next prime (561947).

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 561945 - 2¹ = 561943 is a prime.

561945 is strictly pandigital in base 7.

It is not an unprimeable number, because it can be changed into a prime (561943) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18717 + ... + 18746.

It is an arithmetic number, because the mean of its divisors is an integer number (112392).

2⁵⁶¹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

561945 is a deficient number, since it is larger than the sum of its proper divisors (337191).

561945 is a wasteful number, since it uses less digits than its factorization.

561945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37471.

The product of its digits is 5400, while the sum is 30.

The square root of 561945 is about 749.6299086883. The cubic root of 561945 is about 82.5210231088.

The spelling of 561945 in words is "five hundred sixty-one thousand, nine hundred forty-five".