1205001255 has 32 divisors (see below), whose sum is σ = 1975944960. Its totient is φ = 626734080.

The previous prime is 1205001253. The next prime is 1205001263. The reversal of 1205001255 is 5521005021.

It is not a de Polignac number, because 1205001255 - 2¹ = 1205001253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205001253) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 598200 + ... + 600210.

It is an arithmetic number, because the mean of its divisors is an integer number (61748280).

Almost surely, 2^1205001255 is an apocalyptic number.

1205001255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1205001255 is a deficient number, since it is larger than the sum of its proper divisors (770943705).

1205001255 is a wasteful number, since it uses less digits than its factorization.

1205001255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2991.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 1205001255 is about 34713.1279921588. The cubic root of 1205001255 is about 1064.1328081415.

Adding to 1205001255 its reverse (5521005021), we get a palindrome (6726006276).

The spelling of 1205001255 in words is "one billion, two hundred five million, one thousand, two hundred fifty-five".