561557269 has 16 divisors (see below), whose sum is σ = 705858048. Its totient is φ = 434852352.

The previous prime is 561557263. The next prime is 561557317. The reversal of 561557269 is 962755165.

561557269 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 561557269 - 2⁵ = 561557237 is a prime.

It is a super-2 number, since 2×561557269² = 630693132733476722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561557263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61372 + ... + 69925.

It is an arithmetic number, because the mean of its divisors is an integer number (44116128).

Almost surely, 2^561557269 is an apocalyptic number.

It is an amenable number.

561557269 is a deficient number, since it is larger than the sum of its proper divisors (144300779).

561557269 is a wasteful number, since it uses less digits than its factorization.

561557269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131364.

The product of its digits is 567000, while the sum is 46.

The square root of 561557269 is about 23697.1996024847. The cubic root of 561557269 is about 825.0203944759.

The spelling of 561557269 in words is "five hundred sixty-one million, five hundred fifty-seven thousand, two hundred sixty-nine".