561642236 has 12 divisors (see below), whose sum is σ = 983047800. Its totient is φ = 280771440.

The previous prime is 561642227. The next prime is 561642241. The reversal of 561642236 is 632246165.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 561642196 and 561642205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26726 + ... + 42866.

It is an arithmetic number, because the mean of its divisors is an integer number (81920650).

Almost surely, 2^561642236 is an apocalyptic number.

It is an amenable number.

561642236 is a deficient number, since it is larger than the sum of its proper divisors (421405564).

561642236 is a wasteful number, since it uses less digits than its factorization.

561642236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24844 (or 24842 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 561642236 is about 23698.9922992519. The cubic root of 561642236 is about 825.0620025639.

The spelling of 561642236 in words is "five hundred sixty-one million, six hundred forty-two thousand, two hundred thirty-six".