105521081 has 2 divisors, whose sum is σ = 105521082. Its totient is φ = 105521080.

The previous prime is 105521051. The next prime is 105521083. The reversal of 105521081 is 180125501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69039481 + 36481600 = 8309^2 + 6040^2 .

It is an emirp because it is prime and its reverse (180125501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 105521081 - 2²⁶ = 38412217 is a prime.

It is a super-2 number, since 2×105521081² = 22269397070817122, which contains 22 as substring.

Together with 105521083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (105521083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52760540 + 52760541.

It is an arithmetic number, because the mean of its divisors is an integer number (52760541).

Almost surely, 2^105521081 is an apocalyptic number.

It is an amenable number.

105521081 is a deficient number, since it is larger than the sum of its proper divisors (1).

105521081 is an equidigital number, since it uses as much as digits as its factorization.

105521081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 105521081 is about 10272.3454478517. The cubic root of 105521081 is about 472.5485235200.

Adding to 105521081 its reverse (180125501), we get a palindrome (285646582).

The spelling of 105521081 in words is "one hundred five million, five hundred twenty-one thousand, eighty-one".