731139289 has 2 divisors, whose sum is σ = 731139290. Its totient is φ = 731139288.

The previous prime is 731139287. The next prime is 731139313. The reversal of 731139289 is 982931137.

731139289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638825625 + 92313664 = 25275^2 + 9608^2 .

It is a cyclic number.

It is not a de Polignac number, because 731139289 - 2¹ = 731139287 is a prime.

Together with 731139287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (731139287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365569644 + 365569645.

It is an arithmetic number, because the mean of its divisors is an integer number (365569645).

Almost surely, 2^731139289 is an apocalyptic number.

It is an amenable number.

731139289 is a deficient number, since it is larger than the sum of its proper divisors (1).

731139289 is an equidigital number, since it uses as much as digits as its factorization.

731139289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 731139289 is about 27039.5874413794. The cubic root of 731139289 is about 900.8795060848.

The spelling of 731139289 in words is "seven hundred thirty-one million, one hundred thirty-nine thousand, two hundred eighty-nine".