381817 has 2 divisors, whose sum is σ = 381818. Its totient is φ = 381816.

The previous prime is 381793. The next prime is 381841. The reversal of 381817 is 718183.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (381793) and next prime (381841).

It can be written as a sum of positive squares in only one way, i.e., 281961 + 99856 = 531^2 + 316^2 .

It is an emirp because it is prime and its reverse (718183) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381817 is a prime.

It is not a weakly prime, because it can be changed into another prime (381917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190908 + 190909.

It is an arithmetic number, because the mean of its divisors is an integer number (190909).

2³⁸¹⁸¹⁷ is an apocalyptic number.

It is an amenable number.

381817 is a deficient number, since it is larger than the sum of its proper divisors (1).

381817 is an equidigital number, since it uses as much as digits as its factorization.

381817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 28.

The square root of 381817 is about 617.9134243565. The cubic root of 381817 is about 72.5468266652.

Adding to 381817 its product of digits (1344), we get a square (383161 = 619²).

The spelling of 381817 in words is "three hundred eighty-one thousand, eight hundred seventeen".