105720517 has 8 divisors (see below), whose sum is σ = 121932800. Its totient is φ = 89785584.

The previous prime is 105720499. The next prime is 105720521. The reversal of 105720517 is 715027501.

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

It is not a de Polignac number, because 105720517 - 2¹¹ = 105718469 is a prime.

It is a super-2 number, since 2×105720517² = 22353655429494578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105720557) by changing a digit.

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, 68517 + ... + 70042.

It is an arithmetic number, because the mean of its divisors is an integer number (15241600).

Almost surely, 2^105720517 is an apocalyptic number.

It is an amenable number.

105720517 is a deficient number, since it is larger than the sum of its proper divisors (16212283).

105720517 is a wasteful number, since it uses less digits than its factorization.

105720517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138675.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 105720517 is about 10282.0482881574. The cubic root of 105720517 is about 472.8460434568.

The spelling of 105720517 in words is "one hundred five million, seven hundred twenty thousand, five hundred seventeen".