105521405 has 8 divisors (see below), whose sum is σ = 138137184. Its totient is φ = 76742800.

The previous prime is 105521393. The next prime is 105521443. The reversal of 105521405 is 504125501.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 105521405 - 2⁴ = 105521389 is a prime.

It is a super-2 number, since 2×105521405² = 22269533826348050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 959231 + ... + 959340.

It is an arithmetic number, because the mean of its divisors is an integer number (17267148).

Almost surely, 2^105521405 is an apocalyptic number.

It is an amenable number.

105521405 is a deficient number, since it is larger than the sum of its proper divisors (32615779).

105521405 is a wasteful number, since it uses less digits than its factorization.

105521405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918587.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 105521405 is about 10272.3612183373. The cubic root of 105521405 is about 472.5490071692.

Adding to 105521405 its reverse (504125501), we get a palindrome (609646906).

The spelling of 105521405 in words is "one hundred five million, five hundred twenty-one thousand, four hundred five".