1389256529 has 2 divisors, whose sum is σ = 1389256530. Its totient is φ = 1389256528.

The previous prime is 1389256469. The next prime is 1389256549. The reversal of 1389256529 is 9256529831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 953574400 + 435682129 = 30880^2 + 20873^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389256529 - 2¹⁶ = 1389190993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1389256549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694628264 + 694628265.

It is an arithmetic number, because the mean of its divisors is an integer number (694628265).

Almost surely, 2^1389256529 is an apocalyptic number.

It is an amenable number.

1389256529 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389256529 is an equidigital number, since it uses as much as digits as its factorization.

1389256529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166400, while the sum is 50.

The square root of 1389256529 is about 37272.7317083146. The cubic root of 1389256529 is about 1115.8200189471.

The spelling of 1389256529 in words is "one billion, three hundred eighty-nine million, two hundred fifty-six thousand, five hundred twenty-nine".