561000101 has 2 divisors, whose sum is σ = 561000102. Its totient is φ = 561000100.

The previous prime is 561000091. The next prime is 561000127. The reversal of 561000101 is 101000165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406022500 + 154977601 = 20150^2 + 12449^2 .

It is a cyclic number.

It is not a de Polignac number, because 561000101 - 2²² = 556805797 is a prime.

It is a super-2 number, since 2×561000101² = 629442226644020402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561000191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280500050 + 280500051.

It is an arithmetic number, because the mean of its divisors is an integer number (280500051).

Almost surely, 2^561000101 is an apocalyptic number.

It is an amenable number.

561000101 is a deficient number, since it is larger than the sum of its proper divisors (1).

561000101 is an equidigital number, since it uses as much as digits as its factorization.

561000101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 561000101 is about 23685.4406967656. The cubic root of 561000101 is about 824.7474469069.

Adding to 561000101 its reverse (101000165), we get a palindrome (662000266).

The spelling of 561000101 in words is "five hundred sixty-one million, one hundred one", and thus it is an aban number.