105128449 has 4 divisors (see below), whose sum is σ = 105159600. Its totient is φ = 105097300.

The previous prime is 105128447. The next prime is 105128461. The reversal of 105128449 is 944821501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 944821501 = 13 ⋅72678577.

It is a cyclic number.

It is not a de Polignac number, because 105128449 - 2¹ = 105128447 is a prime.

It is a super-2 number, since 2×105128449² = 22103981578291202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105128447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9799 + ... + 17500.

It is an arithmetic number, because the mean of its divisors is an integer number (26289900).

Almost surely, 2^105128449 is an apocalyptic number.

It is an amenable number.

105128449 is a deficient number, since it is larger than the sum of its proper divisors (31151).

105128449 is an equidigital number, since it uses as much as digits as its factorization.

105128449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31150.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 105128449 is about 10253.2165197074. The cubic root of 105128449 is about 471.9616952181.

The spelling of 105128449 in words is "one hundred five million, one hundred twenty-eight thousand, four hundred forty-nine".