255603217 has 4 divisors (see below), whose sum is σ = 256927780. Its totient is φ = 254278656.

The previous prime is 255603203. The next prime is 255603233. The reversal of 255603217 is 712306552.

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 108805761 + 146797456 = 10431^2 + 12116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255603217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255603247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661992 + ... + 662377.

It is an arithmetic number, because the mean of its divisors is an integer number (64231945).

Almost surely, 2^255603217 is an apocalyptic number.

It is an amenable number.

255603217 is a deficient number, since it is larger than the sum of its proper divisors (1324563).

255603217 is a wasteful number, since it uses less digits than its factorization.

255603217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324562.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 255603217 is about 15987.5957229347. The cubic root of 255603217 is about 634.6322023276.

Adding to 255603217 its reverse (712306552), we get a palindrome (967909769).

The spelling of 255603217 in words is "two hundred fifty-five million, six hundred three thousand, two hundred seventeen".