561100591 has 2 divisors, whose sum is σ = 561100592. Its totient is φ = 561100590.

The previous prime is 561100583. The next prime is 561100627. The reversal of 561100591 is 195001165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561100591 - 2³ = 561100583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561100541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280550295 + 280550296.

It is an arithmetic number, because the mean of its divisors is an integer number (280550296).

Almost surely, 2^561100591 is an apocalyptic number.

561100591 is a deficient number, since it is larger than the sum of its proper divisors (1).

561100591 is an equidigital number, since it uses as much as digits as its factorization.

561100591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 561100591 is about 23687.5619471485. The cubic root of 561100591 is about 824.7966886822.

The spelling of 561100591 in words is "five hundred sixty-one million, one hundred thousand, five hundred ninety-one".