561280633 has 2 divisors, whose sum is σ = 561280634. Its totient is φ = 561280632.

The previous prime is 561280607. The next prime is 561280651. The reversal of 561280633 is 336082165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 457403769 + 103876864 = 21387^2 + 10192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561280633 is a prime.

It is equal to p_29405644 and since 561280633 and 29405644 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (561280663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280640316 + 280640317.

It is an arithmetic number, because the mean of its divisors is an integer number (280640317).

Almost surely, 2^561280633 is an apocalyptic number.

It is an amenable number.

561280633 is a deficient number, since it is larger than the sum of its proper divisors (1).

561280633 is an equidigital number, since it uses as much as digits as its factorization.

561280633 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 34.

The square root of 561280633 is about 23691.3619912406. The cubic root of 561280633 is about 824.8848975629.

The spelling of 561280633 in words is "five hundred sixty-one million, two hundred eighty thousand, six hundred thirty-three".