1131530205 has 24 divisors (see below), whose sum is σ = 1960430688. Its totient is φ = 557059776.

The previous prime is 1131530159. The next prime is 1131530227. The reversal of 1131530205 is 5020351311.

It is not a de Polignac number, because 1131530205 - 2⁷ = 1131530077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220647 + ... + 225716.

It is an arithmetic number, because the mean of its divisors is an integer number (81684612).

Almost surely, 2^1131530205 is an apocalyptic number.

1131530205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131530205 is a deficient number, since it is larger than the sum of its proper divisors (828900483).

1131530205 is a wasteful number, since it uses less digits than its factorization.

1131530205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446397 (or 446384 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1131530205 is about 33638.2253544981. The cubic root of 1131530205 is about 1042.0503820551.

Adding to 1131530205 its reverse (5020351311), we get a palindrome (6151881516).

The spelling of 1131530205 in words is "one billion, one hundred thirty-one million, five hundred thirty thousand, two hundred five".