391801 has 2 divisors, whose sum is σ = 391802. Its totient is φ = 391800.

The previous prime is 391789. The next prime is 391817. The reversal of 391801 is 108193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331776 + 60025 = 576^2 + 245^2 .

It is an emirp because it is prime and its reverse (108193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 391801 - 2¹³ = 383609 is a prime.

It is not a weakly prime, because it can be changed into another prime (391861) 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, 195900 + 195901.

It is an arithmetic number, because the mean of its divisors is an integer number (195901).

2³⁹¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

391801 is a deficient number, since it is larger than the sum of its proper divisors (1).

391801 is an equidigital number, since it uses as much as digits as its factorization.

391801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 391801 is about 625.9400929802. The cubic root of 391801 is about 73.1737277192.

Adding to 391801 its reverse (108193), we get a palindrome (499994).

The spelling of 391801 in words is "three hundred ninety-one thousand, eight hundred one".