8531389 has 2 divisors, whose sum is σ = 8531390. Its totient is φ = 8531388.

The previous prime is 8531381. The next prime is 8531407. The reversal of 8531389 is 9831358.

8531389 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., 8508889 + 22500 = 2917^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 8531389 - 2³ = 8531381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8531381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4265694 + 4265695.

It is an arithmetic number, because the mean of its divisors is an integer number (4265695).

Almost surely, 2^8531389 is an apocalyptic number.

It is an amenable number.

8531389 is a deficient number, since it is larger than the sum of its proper divisors (1).

8531389 is an equidigital number, since it uses as much as digits as its factorization.

8531389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 8531389 is about 2920.8541558934. The cubic root of 8531389 is about 204.3336603659. Note that the first 3 decimals are identical.

The spelling of 8531389 in words is "eight million, five hundred thirty-one thousand, three hundred eighty-nine".