561949 has 4 divisors (see below), whose sum is σ = 567036. Its totient is φ = 556864.

The previous prime is 561947. The next prime is 561961. The reversal of 561949 is 949165.

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

It can be written as a sum of positive squares in 2 ways, for example, as 145924 + 416025 = 382^2 + 645^2 .

It is not a de Polignac number, because 561949 - 2¹ = 561947 is a prime.

It is an Ulam number.

It is a Duffinian number.

561949 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561943) 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, 2374 + ... + 2599.

It is an arithmetic number, because the mean of its divisors is an integer number (141759).

2⁵⁶¹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

561949 is a deficient number, since it is larger than the sum of its proper divisors (5087).

561949 is a wasteful number, since it uses less digits than its factorization.

561949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5086.

The product of its digits is 9720, while the sum is 34.

The square root of 561949 is about 749.6325766667. The cubic root of 561949 is about 82.5212189069.

The spelling of 561949 in words is "five hundred sixty-one thousand, nine hundred forty-nine".