1181205530 has 16 divisors (see below), whose sum is σ = 2127270600. Its totient is φ = 472237632.

The previous prime is 1181205521. The next prime is 1181205533. The reversal of 1181205530 is 355021811.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 979877809 + 201327721 = 31303^2 + 14189^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1181205530.

It is not an unprimeable number, because it can be changed into a prime (1181205533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9605 + ... + 49544.

Almost surely, 2^1181205530 is an apocalyptic number.

1181205530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1181205530 is a deficient number, since it is larger than the sum of its proper divisors (946065070).

1181205530 is a wasteful number, since it uses less digits than its factorization.

1181205530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61153.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1181205530 is about 34368.6707627746. The cubic root of 1181205530 is about 1057.0815443152.

The spelling of 1181205530 in words is "one billion, one hundred eighty-one million, two hundred five thousand, five hundred thirty".