521116105 has 4 divisors (see below), whose sum is σ = 625339332. Its totient is φ = 416892880.

The previous prime is 521116091. The next prime is 521116117. The reversal of 521116105 is 501611125.

It is a happy number.

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 234457344 + 286658761 = 15312^2 + 16931^2 .

It is not a de Polignac number, because 521116105 - 2¹¹ = 521114057 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52111606 + ... + 52111615.

It is an arithmetic number, because the mean of its divisors is an integer number (156334833).

Almost surely, 2^521116105 is an apocalyptic number.

It is an amenable number.

521116105 is a deficient number, since it is larger than the sum of its proper divisors (104223227).

521116105 is a wasteful number, since it uses less digits than its factorization.

521116105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104223226.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 521116105 is about 22827.9676055491. The cubic root of 521116105 is about 804.7200677842.

It can be divided in two parts, 5211 and 16105, that added together give a square (21316 = 146²).

The spelling of 521116105 in words is "five hundred twenty-one million, one hundred sixteen thousand, one hundred five".