1311200321 has 4 divisors (see below), whose sum is σ = 1311939972. Its totient is φ = 1310460672.

The previous prime is 1311200311. The next prime is 1311200323. The reversal of 1311200321 is 1230021131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1230021131 = 31 ⋅39678101.

It can be written as a sum of positive squares in 2 ways, for example, as 953574400 + 357625921 = 30880^2 + 18911^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311200321 - 2¹⁸ = 1310938177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1311200296 and 1311200305.

It is not an unprimeable number, because it can be changed into a prime (1311200323) 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 3 ways as a sum of consecutive naturals, for example, 367160 + ... + 370713.

It is an arithmetic number, because the mean of its divisors is an integer number (327984993).

Almost surely, 2^1311200321 is an apocalyptic number.

It is an amenable number.

1311200321 is a deficient number, since it is larger than the sum of its proper divisors (739651).

1311200321 is an equidigital number, since it uses as much as digits as its factorization.

1311200321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739650.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1311200321 is about 36210.5001484376. The cubic root of 1311200321 is about 1094.5182707574.

Adding to 1311200321 its reverse (1230021131), we get a palindrome (2541221452).

The spelling of 1311200321 in words is "one billion, three hundred eleven million, two hundred thousand, three hundred twenty-one".