1255503605 has 4 divisors (see below), whose sum is σ = 1506604332. Its totient is φ = 1004402880.

The previous prime is 1255503541. The next prime is 1255503643. The reversal of 1255503605 is 5063055521.

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 158105476 + 1097398129 = 12574^2 + 33127^2 .

It is not a de Polignac number, because 1255503605 - 2⁶ = 1255503541 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125550356 + ... + 125550365.

It is an arithmetic number, because the mean of its divisors is an integer number (376651083).

Almost surely, 2^1255503605 is an apocalyptic number.

It is an amenable number.

1255503605 is a deficient number, since it is larger than the sum of its proper divisors (251100727).

1255503605 is an equidigital number, since it uses as much as digits as its factorization.

1255503605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251100726.

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 1255503605 is about 35433.0863036231. The cubic root of 1255503605 is about 1078.7959847596.

The spelling of 1255503605 in words is "one billion, two hundred fifty-five million, five hundred three thousand, six hundred five".