561050111081 has 2 divisors, whose sum is σ = 561050111082. Its totient is φ = 561050111080.

The previous prime is 561050111077. The next prime is 561050111101. The reversal of 561050111081 is 180111050165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309130440025 + 251919671056 = 555995^2 + 501916^2 .

It is a cyclic number.

It is not a de Polignac number, because 561050111081 - 2² = 561050111077 is a prime.

It is a super-3 number, since 3×561050111081³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (561050111381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280525055540 + 280525055541.

It is an arithmetic number, because the mean of its divisors is an integer number (280525055541).

Almost surely, 2^561050111081 is an apocalyptic number.

It is an amenable number.

561050111081 is a deficient number, since it is larger than the sum of its proper divisors (1).

561050111081 is an equidigital number, since it uses as much as digits as its factorization.

561050111081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 29.

The spelling of 561050111081 in words is "five hundred sixty-one billion, fifty million, one hundred eleven thousand, eighty-one".