561919 has 4 divisors (see below), whose sum is σ = 577144. Its totient is φ = 546696.

The previous prime is 561917. The next prime is 561923. The reversal of 561919 is 919165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561919 - 2¹ = 561917 is a prime.

It is a super-2 number, since 2×561919² = 631505925122, which contains 22 as substring.

It is a Duffinian number.

561919 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561917) 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, 7557 + ... + 7630.

It is an arithmetic number, because the mean of its divisors is an integer number (144286).

2⁵⁶¹⁹¹⁹ is an apocalyptic number.

561919 is a deficient number, since it is larger than the sum of its proper divisors (15225).

561919 is a wasteful number, since it uses less digits than its factorization.

561919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15224.

The product of its digits is 2430, while the sum is 31.

The square root of 561919 is about 749.6125665969. The cubic root of 561919 is about 82.5197503984.

The spelling of 561919 in words is "five hundred sixty-one thousand, nine hundred nineteen".