561244581 has 6 divisors (see below), whose sum is σ = 810686630. Its totient is φ = 374163048.

The previous prime is 561244571. The next prime is 561244583. The reversal of 561244581 is 185442165.

It is a happy number.

561244581 is a `hidden beast` number, since 56 + 1 + 24 + 4 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 544475556 + 16769025 = 23334^2 + 4095^2 .

It is not a de Polignac number, because 561244581 - 2⁵ = 561244549 is a prime.

It is a super-2 number, since 2×561244581² = 629990959403731122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561244583) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31180246 + ... + 31180263.

Almost surely, 2^561244581 is an apocalyptic number.

It is an amenable number.

561244581 is a deficient number, since it is larger than the sum of its proper divisors (249442049).

561244581 is a wasteful number, since it uses less digits than its factorization.

561244581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62360515 (or 62360512 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 561244581 is about 23690.6011109891. The cubic root of 561244581 is about 824.8672359362.

The spelling of 561244581 in words is "five hundred sixty-one million, two hundred forty-four thousand, five hundred eighty-one".