101183561 has 4 divisors (see below), whose sum is σ = 101424324. Its totient is φ = 100942800.

The previous prime is 101183491. The next prime is 101183603. The reversal of 101183561 is 165381101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165381101 = 3931 ⋅42071.

It can be written as a sum of positive squares in 2 ways, for example, as 17808400 + 83375161 = 4220^2 + 9131^2 .

It is a cyclic number.

It is not a de Polignac number, because 101183561 - 2²² = 96989257 is a prime.

It is a super-2 number, since 2×101183561² = 20476226033281442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101183561.

It is not an unprimeable number, because it can be changed into a prime (101183461) 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, 119750 + ... + 120591.

It is an arithmetic number, because the mean of its divisors is an integer number (25356081).

Almost surely, 2^101183561 is an apocalyptic number.

It is an amenable number.

101183561 is a deficient number, since it is larger than the sum of its proper divisors (240763).

101183561 is an equidigital number, since it uses as much as digits as its factorization.

101183561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240762.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 101183561 is about 10059.0039765376. The cubic root of 101183561 is about 465.9829072058.

The spelling of 101183561 in words is "one hundred one million, one hundred eighty-three thousand, five hundred sixty-one".