561318269 has 2 divisors, whose sum is σ = 561318270. Its totient is φ = 561318268.

The previous prime is 561318221. The next prime is 561318299. The reversal of 561318269 is 962813165.

561318269 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 559890244 + 1428025 = 23662^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 561318269 - 2²⁸ = 292882813 is a prime.

It is a super-2 number, since 2×561318269² = 630156398226312722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561318299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280659134 + 280659135.

It is an arithmetic number, because the mean of its divisors is an integer number (280659135).

Almost surely, 2^561318269 is an apocalyptic number.

It is an amenable number.

561318269 is a deficient number, since it is larger than the sum of its proper divisors (1).

561318269 is an equidigital number, since it uses as much as digits as its factorization.

561318269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 561318269 is about 23692.1562758648. The cubic root of 561318269 is about 824.9033343735.

The spelling of 561318269 in words is "five hundred sixty-one million, three hundred eighteen thousand, two hundred sixty-nine".