561742 has 4 divisors (see below), whose sum is σ = 842616. Its totient is φ = 280870.

The previous prime is 561733. The next prime is 561761. The reversal of 561742 is 247165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247165 = 5 ⋅49433.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140434 + ... + 140437.

It is an arithmetic number, because the mean of its divisors is an integer number (210654).

2⁵⁶¹⁷⁴² is an apocalyptic number.

561742 is a deficient number, since it is larger than the sum of its proper divisors (280874).

561742 is a wasteful number, since it uses less digits than its factorization.

561742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280873.

The product of its digits is 1680, while the sum is 25.

The square root of 561742 is about 749.4944963107. The cubic root of 561742 is about 82.5110851343.

The spelling of 561742 in words is "five hundred sixty-one thousand, seven hundred forty-two".