1320323121 has 48 divisors (see below), whose sum is σ = 2108106000. Its totient is φ = 791271936.

The previous prime is 1320323023. The next prime is 1320323141. The reversal of 1320323121 is 1213230231.

1320323121 is a `hidden beast` number, since 1 + 320 + 32 + 312 + 1 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 372914721 + 947408400 = 19311^2 + 30780^2 .

It is not a de Polignac number, because 1320323121 - 2⁹ = 1320322609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1320323094 and 1320323103.

It is not an unprimeable number, because it can be changed into a prime (1320323141) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 923235 + ... + 924663.

It is an arithmetic number, because the mean of its divisors is an integer number (43918875).

Almost surely, 2^1320323121 is an apocalyptic number.

It is an amenable number.

1320323121 is a deficient number, since it is larger than the sum of its proper divisors (787782879).

1320323121 is a wasteful number, since it uses less digits than its factorization.

1320323121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650 (or 1647 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1320323121 is about 36336.2507834807. The cubic root of 1320323121 is about 1097.0508110718.

Adding to 1320323121 its reverse (1213230231), we get a palindrome (2533553352).

The spelling of 1320323121 in words is "one billion, three hundred twenty million, three hundred twenty-three thousand, one hundred twenty-one".