561897629 has 2 divisors, whose sum is σ = 561897630. Its totient is φ = 561897628.

The previous prime is 561897607. The next prime is 561897653. The reversal of 561897629 is 926798165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 507285529 + 54612100 = 22523^2 + 7390^2 .

It is a cyclic number.

It is not a de Polignac number, because 561897629 - 2²⁴ = 545120413 is a prime.

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 (561897229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280948814 + 280948815.

It is an arithmetic number, because the mean of its divisors is an integer number (280948815).

Almost surely, 2^561897629 is an apocalyptic number.

It is an amenable number.

561897629 is a deficient number, since it is larger than the sum of its proper divisors (1).

561897629 is an equidigital number, since it uses as much as digits as its factorization.

561897629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 53.

The square root of 561897629 is about 23704.3799539241. The cubic root of 561897629 is about 825.1870425006.

The spelling of 561897629 in words is "five hundred sixty-one million, eight hundred ninety-seven thousand, six hundred twenty-nine".