65381 has 2 divisors, whose sum is σ = 65382. Its totient is φ = 65380.

The previous prime is 65371. The next prime is 65393. The reversal of 65381 is 18356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36481 + 28900 = 191^2 + 170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65381 is a prime.

It is a super-2 number, since 2×65381² = 8549350322, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 65381.

It is not a weakly prime, because it can be changed into another prime (65371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32690 + 32691.

It is an arithmetic number, because the mean of its divisors is an integer number (32691).

2⁶⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

65381 is a deficient number, since it is larger than the sum of its proper divisors (1).

65381 is an equidigital number, since it uses as much as digits as its factorization.

65381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 65381 is about 255.6970864128. The cubic root of 65381 is about 40.2856633876.

The spelling of 65381 in words is "sixty-five thousand, three hundred eighty-one".