1205530155 has 32 divisors (see below), whose sum is σ = 2193016320. Its totient is φ = 627994080.

The previous prime is 1205530153. The next prime is 1205530169. The reversal of 1205530155 is 5510355021.

1205530155 is a `hidden beast` number, since 120 + 5 + 530 + 1 + 5 + 5 = 666.

It is not a de Polignac number, because 1205530155 - 2¹ = 1205530153 is a prime.

It is a super-2 number, since 2×1205530155² = 2906605909228648050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1205530153) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 98031 + ... + 109640.

It is an arithmetic number, because the mean of its divisors is an integer number (68531760).

Almost surely, 2^1205530155 is an apocalyptic number.

1205530155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1205530155 is a deficient number, since it is larger than the sum of its proper divisors (987486165).

1205530155 is a wasteful number, since it uses less digits than its factorization.

1205530155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207728 (or 207722 counting only the distinct ones).

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

The square root of 1205530155 is about 34720.7453117009. The cubic root of 1205530155 is about 1064.2884753425.

Adding to 1205530155 its reverse (5510355021), we get a palindrome (6715885176).

The spelling of 1205530155 in words is "one billion, two hundred five million, five hundred thirty thousand, one hundred fifty-five".