561081623 has 2 divisors, whose sum is σ = 561081624. Its totient is φ = 561081622.

The previous prime is 561081581. The next prime is 561081649. The reversal of 561081623 is 326180165.

It is a happy number.

561081623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561081623 - 2⁶ = 561081559 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561081623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561081683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280540811 + 280540812.

It is an arithmetic number, because the mean of its divisors is an integer number (280540812).

Almost surely, 2^561081623 is an apocalyptic number.

561081623 is a deficient number, since it is larger than the sum of its proper divisors (1).

561081623 is an equidigital number, since it uses as much as digits as its factorization.

561081623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 561081623 is about 23687.1615648646. The cubic root of 561081623 is about 824.7873944962.

The spelling of 561081623 in words is "five hundred sixty-one million, eighty-one thousand, six hundred twenty-three".