561394 has 4 divisors (see below), whose sum is σ = 842094. Its totient is φ = 280696.

The previous prime is 561389. The next prime is 561409. The reversal of 561394 is 493165.

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

It can be written as a sum of positive squares in only one way, i.e., 543169 + 18225 = 737^2 + 135^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140347 + ... + 140350.

2⁵⁶¹³⁹⁴ is an apocalyptic number.

561394 is a deficient number, since it is larger than the sum of its proper divisors (280700).

561394 is a wasteful number, since it uses less digits than its factorization.

561394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280699.

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

The square root of 561394 is about 749.2623038696. The cubic root of 561394 is about 82.4940430348.

The spelling of 561394 in words is "five hundred sixty-one thousand, three hundred ninety-four".