1131230321 has 16 divisors (see below), whose sum is σ = 1277867136. Its totient is φ = 993586176.

The previous prime is 1131230311. The next prime is 1131230333. The reversal of 1131230321 is 1230321311.

It is a cyclic number.

It is not a de Polignac number, because 1131230321 - 2⁶ = 1131230257 is a prime.

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 1131230321.

It is not an unprimeable number, because it can be changed into a prime (1131230311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47906 + ... + 67508.

It is an arithmetic number, because the mean of its divisors is an integer number (79866696).

Almost surely, 2^1131230321 is an apocalyptic number.

It is an amenable number.

1131230321 is a deficient number, since it is larger than the sum of its proper divisors (146636815).

1131230321 is a wasteful number, since it uses less digits than its factorization.

1131230321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19832.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1131230321 is about 33633.7675707019. The cubic root of 1131230321 is about 1041.9583173903.

Adding to 1131230321 its reverse (1230321311), we get a palindrome (2361551632).

The spelling of 1131230321 in words is "one billion, one hundred thirty-one million, two hundred thirty thousand, three hundred twenty-one".