561409934 has 4 divisors (see below), whose sum is σ = 842114904. Its totient is φ = 280704966.

The previous prime is 561409903. The next prime is 561409939. The reversal of 561409934 is 439904165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 439904165 = 5 ⋅87980833.

It is a super-2 number, since 2×561409934² = 630362227987768712, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 561409891 and 561409900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561409939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140352482 + ... + 140352485.

It is an arithmetic number, because the mean of its divisors is an integer number (210528726).

Almost surely, 2^561409934 is an apocalyptic number.

561409934 is a deficient number, since it is larger than the sum of its proper divisors (280704970).

561409934 is a wasteful number, since it uses less digits than its factorization.

561409934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280704969.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 561409934 is about 23694.0906978934. The cubic root of 561409934 is about 824.9482350135.

The spelling of 561409934 in words is "five hundred sixty-one million, four hundred nine thousand, nine hundred thirty-four".