105220145 has 8 divisors (see below), whose sum is σ = 129344040. Its totient is φ = 82122880.

The previous prime is 105220139. The next prime is 105220151. The reversal of 105220145 is 541022501.

It is an interprime number because it is at equal distance from previous prime (105220139) and next prime (105220151).

It can be written as a sum of positive squares in 4 ways, for example, as 11343424 + 93876721 = 3368^2 + 9689^2 .

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

It is not a de Polignac number, because 105220145 - 2²⁰ = 104171569 is a prime.

It is a super-2 number, since 2×105220145² = 22142557827642050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256430 + ... + 256839.

It is an arithmetic number, because the mean of its divisors is an integer number (16168005).

Almost surely, 2^105220145 is an apocalyptic number.

It is an amenable number.

105220145 is a deficient number, since it is larger than the sum of its proper divisors (24123895).

105220145 is an equidigital number, since it uses as much as digits as its factorization.

105220145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513315.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 105220145 is about 10257.6871174744. The cubic root of 105220145 is about 472.0988747784.

Adding to 105220145 its reverse (541022501), we get a palindrome (646242646).

The spelling of 105220145 in words is "one hundred five million, two hundred twenty thousand, one hundred forty-five".