561056791 has 2 divisors, whose sum is σ = 561056792. Its totient is φ = 561056790.

The previous prime is 561056773. The next prime is 561056849. The reversal of 561056791 is 197650165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561056791 - 2²³ = 552668183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561056701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280528395 + 280528396.

It is an arithmetic number, because the mean of its divisors is an integer number (280528396).

Almost surely, 2^561056791 is an apocalyptic number.

561056791 is a deficient number, since it is larger than the sum of its proper divisors (1).

561056791 is an equidigital number, since it uses as much as digits as its factorization.

561056791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 561056791 is about 23686.6373932646. The cubic root of 561056791 is about 824.7752266749.

The spelling of 561056791 in words is "five hundred sixty-one million, fifty-six thousand, seven hundred ninety-one".