1131125205 has 64 divisors (see below), whose sum is σ = 2116730880. Its totient is φ = 505080576.

The previous prime is 1131125201. The next prime is 1131125207. The reversal of 1131125205 is 5025211311.

It is not a de Polignac number, because 1131125205 - 2² = 1131125201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131125201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2442804 + ... + 2443266.

It is an arithmetic number, because the mean of its divisors is an integer number (33073920).

Almost surely, 2^1131125205 is an apocalyptic number.

1131125205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131125205 is a deficient number, since it is larger than the sum of its proper divisors (985605675).

1131125205 is a wasteful number, since it uses less digits than its factorization.

1131125205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1131125205 is about 33632.2048786576. The cubic root of 1131125205 is about 1041.9260428301.

Adding to 1131125205 its reverse (5025211311), we get a palindrome (6156336516).

The spelling of 1131125205 in words is "one billion, one hundred thirty-one million, one hundred twenty-five thousand, two hundred five".