1321443239 has 4 divisors (see below), whose sum is σ = 1321633656. Its totient is φ = 1321252824.

The previous prime is 1321443209. The next prime is 1321443251. The reversal of 1321443239 is 9323441231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9323441231 = 13 ⋅717187787.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321443239 is a prime.

It is a super-2 number, since 2×1321443239² = 3492424467797622242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321443209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84389 + ... + 98814.

It is an arithmetic number, because the mean of its divisors is an integer number (330408414).

Almost surely, 2^1321443239 is an apocalyptic number.

1321443239 is a deficient number, since it is larger than the sum of its proper divisors (190417).

1321443239 is an equidigital number, since it uses as much as digits as its factorization.

1321443239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190416.

The product of its digits is 15552, while the sum is 32.

The square root of 1321443239 is about 36351.6607461062. The cubic root of 1321443239 is about 1097.3609571277.

The spelling of 1321443239 in words is "one billion, three hundred twenty-one million, four hundred forty-three thousand, two hundred thirty-nine".