308641 has 2 divisors, whose sum is σ = 308642. Its totient is φ = 308640.

The previous prime is 308639. The next prime is 308663. The reversal of 308641 is 146803.

It is an a-pointer prime, because the next prime (308663) can be obtained adding 308641 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216225 + 92416 = 465^2 + 304^2 .

It is a cyclic number.

It is not a de Polignac number, because 308641 - 2¹ = 308639 is a prime.

Together with 308639, it forms a pair of twin primes.

It is a Chen prime.

308641 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (308621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154320 + 154321.

It is an arithmetic number, because the mean of its divisors is an integer number (154321).

2³⁰⁸⁶⁴¹ is an apocalyptic number.

It is an amenable number.

308641 is a deficient number, since it is larger than the sum of its proper divisors (1).

308641 is an equidigital number, since it uses as much as digits as its factorization.

308641 is an odious number, because the sum of its binary digits is odd.

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

The square root of 308641 is about 555.5546777771. The cubic root of 308641 is about 67.5799509887.

It can be divided in two parts, 308 and 641, that added together give a palindrome (949).

The spelling of 308641 in words is "three hundred eight thousand, six hundred forty-one".