395581 has 2 divisors, whose sum is σ = 395582. Its totient is φ = 395580.

The previous prime is 395543. The next prime is 395597. The reversal of 395581 is 185593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210681 + 184900 = 459^2 + 430^2 .

It is an emirp because it is prime and its reverse (185593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 395581 - 2⁷ = 395453 is a prime.

It is a super-2 number, since 2×395581² = 312968655122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197790 + 197791.

It is an arithmetic number, because the mean of its divisors is an integer number (197791).

2³⁹⁵⁵⁸¹ is an apocalyptic number.

It is an amenable number.

395581 is a deficient number, since it is larger than the sum of its proper divisors (1).

395581 is an equidigital number, since it uses as much as digits as its factorization.

395581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 31.

The square root of 395581 is about 628.9523034380. The cubic root of 395581 is about 73.4082957063.

The spelling of 395581 in words is "three hundred ninety-five thousand, five hundred eighty-one".