561718 has 4 divisors (see below), whose sum is σ = 842580. Its totient is φ = 280858.

The previous prime is 561713. The next prime is 561733. The reversal of 561718 is 817165.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 817165 = 5 ⋅163433.

It is a super-2 number, since 2×561718² = 631054223048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140428 + ... + 140431.

It is an arithmetic number, because the mean of its divisors is an integer number (210645).

2⁵⁶¹⁷¹⁸ is an apocalyptic number.

561718 is a deficient number, since it is larger than the sum of its proper divisors (280862).

561718 is a wasteful number, since it uses less digits than its factorization.

561718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280861.

The product of its digits is 1680, while the sum is 28.

The square root of 561718 is about 749.4784853483. The cubic root of 561718 is about 82.5099100431.

The spelling of 561718 in words is "five hundred sixty-one thousand, seven hundred eighteen".