561493 has 4 divisors (see below), whose sum is σ = 594540. Its totient is φ = 528448.

The previous prime is 561461. The next prime is 561521. The reversal of 561493 is 394165.

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 154449 + 407044 = 393^2 + 638^2 .

It is a cyclic number.

It is not a de Polignac number, because 561493 - 2⁵ = 561461 is a prime.

It is a Duffinian number.

561493 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (562493) 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, 16498 + ... + 16531.

It is an arithmetic number, because the mean of its divisors is an integer number (148635).

2⁵⁶¹⁴⁹³ is an apocalyptic number.

It is an amenable number.

561493 is a deficient number, since it is larger than the sum of its proper divisors (33047).

561493 is a wasteful number, since it uses less digits than its factorization.

561493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33046.

The product of its digits is 3240, while the sum is 28.

The square root of 561493 is about 749.3283659385. The cubic root of 561493 is about 82.4988919349.

The spelling of 561493 in words is "five hundred sixty-one thousand, four hundred ninety-three".