1389016549 has 2 divisors, whose sum is σ = 1389016550. Its totient is φ = 1389016548.

The previous prime is 1389016513. The next prime is 1389016579. The reversal of 1389016549 is 9456109831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 943595524 + 445421025 = 30718^2 + 21105^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389016549 - 2²¹ = 1386919397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1389016499 and 1389016508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389016579) 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, 694508274 + 694508275.

It is an arithmetic number, because the mean of its divisors is an integer number (694508275).

Almost surely, 2^1389016549 is an apocalyptic number.

It is an amenable number.

1389016549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389016549 is an equidigital number, since it uses as much as digits as its factorization.

1389016549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 1389016549 is about 37269.5123257603. The cubic root of 1389016549 is about 1115.7557663769.

The spelling of 1389016549 in words is "one billion, three hundred eighty-nine million, sixteen thousand, five hundred forty-nine".