1321072307 has 2 divisors, whose sum is σ = 1321072308. Its totient is φ = 1321072306.

The previous prime is 1321072279. The next prime is 1321072339. The reversal of 1321072307 is 7032701231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321072307 - 2⁶ = 1321072243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321072387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660536153 + 660536154.

It is an arithmetic number, because the mean of its divisors is an integer number (660536154).

Almost surely, 2^1321072307 is an apocalyptic number.

1321072307 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321072307 is an equidigital number, since it uses as much as digits as its factorization.

1321072307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 1321072307 is about 36346.5583927832. The cubic root of 1321072307 is about 1097.2582703141.

Adding to 1321072307 its reverse (7032701231), we get a palindrome (8353773538).

The spelling of 1321072307 in words is "one billion, three hundred twenty-one million, seventy-two thousand, three hundred seven".