561979 has 8 divisors (see below), whose sum is σ = 626688. Its totient is φ = 499560.

The previous prime is 561973. The next prime is 561983. The reversal of 561979 is 979165.

561979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 561979 - 2⁵ = 561947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27 + ... + 1060.

It is an arithmetic number, because the mean of its divisors is an integer number (78336).

2⁵⁶¹⁹⁷⁹ is an apocalyptic number.

561979 is a deficient number, since it is larger than the sum of its proper divisors (64709).

561979 is a wasteful number, since it uses less digits than its factorization.

561979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145.

The product of its digits is 17010, while the sum is 37.

The square root of 561979 is about 749.6525862024. The cubic root of 561979 is about 82.5226873631.

It can be divided in two parts, 561 and 979, that added together give a triangular number (1540 = T₅₅).

The spelling of 561979 in words is "five hundred sixty-one thousand, nine hundred seventy-nine".