561000561 has 32 divisors (see below), whose sum is σ = 872643456. Its totient is φ = 316800000.

The previous prime is 561000551. The next prime is 561000571. The reversal of 561000561 is 165000165.

It is an interprime number because it is at equal distance from previous prime (561000551) and next prime (561000571).

It is not a de Polignac number, because 561000561 - 2¹⁷ = 560869489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561000551) 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 in 31 ways as a sum of consecutive naturals, for example, 51711 + ... + 61611.

It is an arithmetic number, because the mean of its divisors is an integer number (27270108).

Almost surely, 2^561000561 is an apocalyptic number.

561000561 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

561000561 is a deficient number, since it is larger than the sum of its proper divisors (311642895).

561000561 is a wasteful number, since it uses less digits than its factorization.

561000561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10033.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 561000561 is about 23685.4504073703. The cubic root of 561000561 is about 824.7476723280.

The spelling of 561000561 in words is "five hundred sixty-one million, five hundred sixty-one", and thus it is an aban number.