561773669 has 2 divisors, whose sum is σ = 561773670. Its totient is φ = 561773668.

The previous prime is 561773623. The next prime is 561773699. The reversal of 561773669 is 966377165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495952900 + 65820769 = 22270^2 + 8113^2 .

It is a cyclic number.

It is not a de Polignac number, because 561773669 - 2²⁴ = 544996453 is a prime.

It is a super-2 number, since 2×561773669² = 631179310363443122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561773609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280886834 + 280886835.

It is an arithmetic number, because the mean of its divisors is an integer number (280886835).

Almost surely, 2^561773669 is an apocalyptic number.

It is an amenable number.

561773669 is a deficient number, since it is larger than the sum of its proper divisors (1).

561773669 is an equidigital number, since it uses as much as digits as its factorization.

561773669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 50.

The square root of 561773669 is about 23701.7651030467. The cubic root of 561773669 is about 825.1263566487.

The spelling of 561773669 in words is "five hundred sixty-one million, seven hundred seventy-three thousand, six hundred sixty-nine".