561531629 has 2 divisors, whose sum is σ = 561531630. Its totient is φ = 561531628.

The previous prime is 561531601. The next prime is 561531667. The reversal of 561531629 is 926135165.

561531629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (561531667) can be obtained adding 561531629 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525555625 + 35976004 = 22925^2 + 5998^2 .

It is a cyclic number.

It is not a de Polignac number, because 561531629 - 2²⁸ = 293096173 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 561531592 and 561531601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561531689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280765814 + 280765815.

It is an arithmetic number, because the mean of its divisors is an integer number (280765815).

Almost surely, 2^561531629 is an apocalyptic number.

It is an amenable number.

561531629 is a deficient number, since it is larger than the sum of its proper divisors (1).

561531629 is an equidigital number, since it uses as much as digits as its factorization.

561531629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 38.

The square root of 561531629 is about 23696.6586041155. The cubic root of 561531629 is about 825.0078378196.

The spelling of 561531629 in words is "five hundred sixty-one million, five hundred thirty-one thousand, six hundred twenty-nine".