383681 has 2 divisors, whose sum is σ = 383682. Its totient is φ = 383680.

The previous prime is 383659. The next prime is 383683. The reversal of 383681 is 186383.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379456 + 4225 = 616^2 + 65^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-383681 is a prime.

It is a super-2 number, since 2×383681² = 294422219522, which contains 22 as substring.

Together with 383683, it forms a pair of twin primes.

It is a Chen prime.

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 383681.

It is not a weakly prime, because it can be changed into another prime (383683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191840 + 191841.

It is an arithmetic number, because the mean of its divisors is an integer number (191841).

2³⁸³⁶⁸¹ is an apocalyptic number.

It is an amenable number.

383681 is a deficient number, since it is larger than the sum of its proper divisors (1).

383681 is an equidigital number, since it uses as much as digits as its factorization.

383681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 383681 is about 619.4198898970. The cubic root of 383681 is about 72.6646910030.

The spelling of 383681 in words is "three hundred eighty-three thousand, six hundred eighty-one".