71389 has 2 divisors, whose sum is σ = 71390. Its totient is φ = 71388.

The previous prime is 71387. The next prime is 71399. The reversal of 71389 is 98317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71289 + 100 = 267^2 + 10^2 .

It is an emirp because it is prime and its reverse (98317) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71389 - 2¹ = 71387 is a prime.

Together with 71387, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35694 + 35695.

It is an arithmetic number, because the mean of its divisors is an integer number (35695).

2⁷¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

71389 is a deficient number, since it is larger than the sum of its proper divisors (1).

71389 is an equidigital number, since it uses as much as digits as its factorization.

71389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 71389 is about 267.1872002922. The cubic root of 71389 is about 41.4836631880.

Adding to 71389 its sum of digits (28), we get a palindrome (71417).

The spelling of 71389 in words is "seventy-one thousand, three hundred eighty-nine".