1131020205 has 32 divisors (see below), whose sum is σ = 2110368000. Its totient is φ = 517035456.

The previous prime is 1131020203. The next prime is 1131020221. The reversal of 1131020205 is 5020201311.

It is not a de Polignac number, because 1131020205 - 2¹ = 1131020203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131020203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104770 + ... + 115059.

It is an arithmetic number, because the mean of its divisors is an integer number (65949000).

Almost surely, 2^1131020205 is an apocalyptic number.

1131020205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131020205 is a deficient number, since it is larger than the sum of its proper divisors (979347795).

1131020205 is an equidigital number, since it uses as much as digits as its factorization.

1131020205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219858 (or 219844 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1131020205 is about 33630.6438386184. The cubic root of 1131020205 is about 1041.8938018901.

Adding to 1131020205 its reverse (5020201311), we get a palindrome (6151221516).

The spelling of 1131020205 in words is "one billion, one hundred thirty-one million, twenty thousand, two hundred five".