1205013555 has 48 divisors (see below), whose sum is σ = 2185787136. Its totient is φ = 613370880.

The previous prime is 1205013541. The next prime is 1205013569. The reversal of 1205013555 is 5553105021.

1205013555 is a `hidden beast` number, since 120 + 501 + 35 + 5 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1205013541) and next prime (1205013569).

It is not a de Polignac number, because 1205013555 - 2¹⁰ = 1205012531 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95919 + ... + 107751.

It is an arithmetic number, because the mean of its divisors is an integer number (45537232).

Almost surely, 2^1205013555 is an apocalyptic number.

1205013555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1205013555 is a deficient number, since it is larger than the sum of its proper divisors (980773581).

1205013555 is a wasteful number, since it uses less digits than its factorization.

1205013555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11948 (or 11945 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 1205013555 is about 34713.3051581090. The cubic root of 1205013555 is about 1064.1364288262.

Adding to 1205013555 its reverse (5553105021), we get a palindrome (6758118576).

The spelling of 1205013555 in words is "one billion, two hundred five million, thirteen thousand, five hundred fifty-five".