105055561 has 4 divisors (see below), whose sum is σ = 113136772. Its totient is φ = 96974352.

The previous prime is 105055547. The next prime is 105055583. The reversal of 105055561 is 165550501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165550501 = 67 ⋅2470903.

It can be written as a sum of positive squares in 2 ways, for example, as 29365561 + 75690000 = 5419^2 + 8700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105055561 is a prime.

It is a super-2 number, since 2×105055561² = 22073341794049442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105055591) 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, 4040586 + ... + 4040611.

It is an arithmetic number, because the mean of its divisors is an integer number (28284193).

Almost surely, 2^105055561 is an apocalyptic number.

It is an amenable number.

105055561 is a deficient number, since it is larger than the sum of its proper divisors (8081211).

105055561 is an equidigital number, since it uses as much as digits as its factorization.

105055561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8081210.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 105055561 is about 10249.6615066060. The cubic root of 105055561 is about 471.8525959920.

The spelling of 105055561 in words is "one hundred five million, fifty-five thousand, five hundred sixty-one".