101561165 has 4 divisors (see below), whose sum is σ = 121873404. Its totient is φ = 81248928.

The previous prime is 101561149. The next prime is 101561167. The reversal of 101561165 is 561165101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52041796 + 49519369 = 7214^2 + 7037^2 .

It is a cyclic number.

It is not a de Polignac number, because 101561165 - 2⁴ = 101561149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101561167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10156112 + ... + 10156121.

It is an arithmetic number, because the mean of its divisors is an integer number (30468351).

Almost surely, 2^101561165 is an apocalyptic number.

It is an amenable number.

101561165 is a deficient number, since it is larger than the sum of its proper divisors (20312239).

101561165 is an equidigital number, since it uses as much as digits as its factorization.

101561165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20312238.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 101561165 is about 10077.7559506073. The cubic root of 101561165 is about 466.5618503255.

It can be divided in two parts, 101 and 561165, that multiplied together give a palindrome (56677665).

The spelling of 101561165 in words is "one hundred one million, five hundred sixty-one thousand, one hundred sixty-five".