561810269 has 2 divisors, whose sum is σ = 561810270. Its totient is φ = 561810268.

The previous prime is 561810247. The next prime is 561810287. The reversal of 561810269 is 962018165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493417369 + 68392900 = 22213^2 + 8270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561810269 is a prime.

It is a super-2 number, since 2×561810269² = 631261556707704722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561810239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280905134 + 280905135.

It is an arithmetic number, because the mean of its divisors is an integer number (280905135).

Almost surely, 2^561810269 is an apocalyptic number.

It is an amenable number.

561810269 is a deficient number, since it is larger than the sum of its proper divisors (1).

561810269 is an equidigital number, since it uses as much as digits as its factorization.

561810269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 561810269 is about 23702.5371848669. The cubic root of 561810269 is about 825.1442754717.

The spelling of 561810269 in words is "five hundred sixty-one million, eight hundred ten thousand, two hundred sixty-nine".