64381 has 2 divisors, whose sum is σ = 64382. Its totient is φ = 64380.

The previous prime is 64373. The next prime is 64399. The reversal of 64381 is 18346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60025 + 4356 = 245^2 + 66^2 .

It is a cyclic number.

It is not a de Polignac number, because 64381 - 2³ = 64373 is a prime.

It is a super-2 number, since 2×64381² = 8289826322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32190 + 32191.

It is an arithmetic number, because the mean of its divisors is an integer number (32191).

2⁶⁴³⁸¹ is an apocalyptic number.

It is an amenable number.

64381 is a deficient number, since it is larger than the sum of its proper divisors (1).

64381 is an equidigital number, since it uses as much as digits as its factorization.

64381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

The square root of 64381 is about 253.7341128031. The cubic root of 64381 is about 40.0792180091.

The spelling of 64381 in words is "sixty-four thousand, three hundred eighty-one".