101611561 has 2 divisors, whose sum is σ = 101611562. Its totient is φ = 101611560.

The previous prime is 101611529. The next prime is 101611613. The reversal of 101611561 is 165116101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64705936 + 36905625 = 8044^2 + 6075^2 .

It is an emirp because it is prime and its reverse (165116101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101611561 - 2⁵ = 101611529 is a prime.

It is not a weakly prime, because it can be changed into another prime (101611501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50805780 + 50805781.

It is an arithmetic number, because the mean of its divisors is an integer number (50805781).

Almost surely, 2^101611561 is an apocalyptic number.

It is an amenable number.

101611561 is a deficient number, since it is larger than the sum of its proper divisors (1).

101611561 is an equidigital number, since it uses as much as digits as its factorization.

101611561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 101611561 is about 10080.2559987334. The cubic root of 101611561 is about 466.6390089618.

Adding to 101611561 its reverse (165116101), we get a palindrome (266727662).

The spelling of 101611561 in words is "one hundred one million, six hundred eleven thousand, five hundred sixty-one".