561055553 has 2 divisors, whose sum is σ = 561055554. Its totient is φ = 561055552.

The previous prime is 561055549. The next prime is 561055567. The reversal of 561055553 is 355550165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 407716864 + 153338689 = 20192^2 + 12383^2 .

It is a cyclic number.

It is not a de Polignac number, because 561055553 - 2² = 561055549 is a prime.

It is not a weakly prime, because it can be changed into another prime (561075553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280527776 + 280527777.

It is an arithmetic number, because the mean of its divisors is an integer number (280527777).

Almost surely, 2^561055553 is an apocalyptic number.

It is an amenable number.

561055553 is a deficient number, since it is larger than the sum of its proper divisors (1).

561055553 is an equidigital number, since it uses as much as digits as its factorization.

561055553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56250, while the sum is 35.

The square root of 561055553 is about 23686.6112603724. The cubic root of 561055553 is about 824.7746200385.

The spelling of 561055553 in words is "five hundred sixty-one million, fifty-five thousand, five hundred fifty-three".