561055361 has 2 divisors, whose sum is σ = 561055362. Its totient is φ = 561055360.

The previous prime is 561055331. The next prime is 561055423. The reversal of 561055361 is 163550165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391248400 + 169806961 = 19780^2 + 13031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561055361 is a prime.

It is not a weakly prime, because it can be changed into another prime (561055331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280527680 + 280527681.

It is an arithmetic number, because the mean of its divisors is an integer number (280527681).

Almost surely, 2^561055361 is an apocalyptic number.

It is an amenable number.

561055361 is a deficient number, since it is larger than the sum of its proper divisors (1).

561055361 is an equidigital number, since it uses as much as digits as its factorization.

561055361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 561055361 is about 23686.6072074495. The cubic root of 561055361 is about 824.7745259558.

The spelling of 561055361 in words is "five hundred sixty-one million, fifty-five thousand, three hundred sixty-one".