105780217 has 4 divisors (see below), whose sum is σ = 105814180. Its totient is φ = 105746256.

The previous prime is 105780211. The next prime is 105780247. The reversal of 105780217 is 712087501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712087501 = 277 ⋅2570713.

It can be written as a sum of positive squares in 2 ways, for example, as 4596736 + 101183481 = 2144^2 + 10059^2 .

It is a cyclic number.

It is not a de Polignac number, because 105780217 - 2⁷ = 105780089 is a prime.

It is a super-2 number, since 2×105780217² = 22378908617134178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105780211) 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, 11778 + ... + 18715.

It is an arithmetic number, because the mean of its divisors is an integer number (26453545).

Almost surely, 2^105780217 is an apocalyptic number.

It is an amenable number.

105780217 is a deficient number, since it is larger than the sum of its proper divisors (33963).

105780217 is an equidigital number, since it uses as much as digits as its factorization.

105780217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33962.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 105780217 is about 10284.9509964802. The cubic root of 105780217 is about 472.9350315349.

The spelling of 105780217 in words is "one hundred five million, seven hundred eighty thousand, two hundred seventeen".