111101020561 has 2 divisors, whose sum is σ = 111101020562. Its totient is φ = 111101020560.

The previous prime is 111101020553. The next prime is 111101020571. The reversal of 111101020561 is 165020101111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109018832400 + 2082188161 = 330180^2 + 45631^2 .

It is a cyclic number.

It is not a de Polignac number, because 111101020561 - 2³ = 111101020553 is a prime.

It is not a weakly prime, because it can be changed into another prime (111101020571) 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, 55550510280 + 55550510281.

It is an arithmetic number, because the mean of its divisors is an integer number (55550510281).

Almost surely, 2^111101020561 is an apocalyptic number.

It is an amenable number.

111101020561 is a deficient number, since it is larger than the sum of its proper divisors (1).

111101020561 is an equidigital number, since it uses as much as digits as its factorization.

111101020561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 19.

Adding to 111101020561 its reverse (165020101111), we get a palindrome (276121121672).

The spelling of 111101020561 in words is "one hundred eleven billion, one hundred one million, twenty thousand, five hundred sixty-one".