315105205 has 4 divisors (see below), whose sum is σ = 378126252. Its totient is φ = 252084160.

The previous prime is 315105191. The next prime is 315105257. The reversal of 315105205 is 502501513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60575089 + 254530116 = 7783^2 + 15954^2 .

It is not a de Polignac number, because 315105205 - 2¹¹ = 315103157 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

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, 31510516 + ... + 31510525.

It is an arithmetic number, because the mean of its divisors is an integer number (94531563).

Almost surely, 2^315105205 is an apocalyptic number.

It is an amenable number.

315105205 is a deficient number, since it is larger than the sum of its proper divisors (63021047).

315105205 is an equidigital number, since it uses as much as digits as its factorization.

315105205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63021046.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 315105205 is about 17751.2029169857. The cubic root of 315105205 is about 680.4849517895.

Adding to 315105205 its reverse (502501513), we get a palindrome (817606718).

The spelling of 315105205 in words is "three hundred fifteen million, one hundred five thousand, two hundred five".