245215105 has 4 divisors (see below), whose sum is σ = 294258132. Its totient is φ = 196172080.

The previous prime is 245215093. The next prime is 245215133. The reversal of 245215105 is 501512542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 501512542 = 2 ⋅250756271.

It can be written as a sum of positive squares in 2 ways, for example, as 35892081 + 209323024 = 5991^2 + 14468^2 .

It is not a de Polignac number, because 245215105 - 2⁵ = 245215073 is a prime.

It is a super-2 number, since 2×245215105² = 120260895440322050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 245215105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24521506 + ... + 24521515.

It is an arithmetic number, because the mean of its divisors is an integer number (73564533).

Almost surely, 2^245215105 is an apocalyptic number.

It is an amenable number.

245215105 is a deficient number, since it is larger than the sum of its proper divisors (49043027).

245215105 is an equidigital number, since it uses as much as digits as its factorization.

245215105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49043026.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 245215105 is about 15659.3456121257. The cubic root of 245215105 is about 625.9155477807.

Adding to 245215105 its reverse (501512542), we get a palindrome (746727647).

It can be divided in two parts, 245 and 215105, that multiplied together give a palindrome (52700725).

The spelling of 245215105 in words is "two hundred forty-five million, two hundred fifteen thousand, one hundred five".