2256170405 has 4 divisors (see below), whose sum is σ = 2707404492. Its totient is φ = 1804936320.

The previous prime is 2256170393. The next prime is 2256170429. The reversal of 2256170405 is 5040716522.

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 1116027649 + 1140142756 = 33407^2 + 33766^2 .

It is not a de Polignac number, because 2256170405 - 2⁸ = 2256170149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225617036 + ... + 225617045.

It is an arithmetic number, because the mean of its divisors is an integer number (676851123).

Almost surely, 2^2256170405 is an apocalyptic number.

It is an amenable number.

2256170405 is a deficient number, since it is larger than the sum of its proper divisors (451234087).

2256170405 is an equidigital number, since it uses as much as digits as its factorization.

2256170405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451234086.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 2256170405 is about 47499.1621505053. The cubic root of 2256170405 is about 1311.5674582740.

Adding to 2256170405 its reverse (5040716522), we get a palindrome (7296886927).

The spelling of 2256170405 in words is "two billion, two hundred fifty-six million, one hundred seventy thousand, four hundred five".