1231321130 has 16 divisors (see below), whose sum is σ = 2386868904. Its totient is φ = 454641600.

The previous prime is 1231321129. The next prime is 1231321151. The reversal of 1231321130 is 311231321.

It can be written as a sum of positive squares in 4 ways, for example, as 870663049 + 360658081 = 29507^2 + 18991^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1231321099 and 1231321108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4735721 + ... + 4735980.

Almost surely, 2^1231321130 is an apocalyptic number.

1231321130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1231321130 is a deficient number, since it is larger than the sum of its proper divisors (1155547774).

1231321130 is a wasteful number, since it uses less digits than its factorization.

1231321130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9471721.

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

The square root of 1231321130 is about 35090.1856649406. The cubic root of 1231321130 is about 1071.8247403441.

Adding to 1231321130 its reverse (311231321), we get a palindrome (1542552451).

The spelling of 1231321130 in words is "one billion, two hundred thirty-one million, three hundred twenty-one thousand, one hundred thirty".