863641 has 2 divisors, whose sum is σ = 863642. Its totient is φ = 863640.

The previous prime is 863633. The next prime is 863671. The reversal of 863641 is 146368.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 687241 + 176400 = 829^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 863641 - 2³ = 863633 is a prime.

863641 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (863671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431820 + 431821.

It is an arithmetic number, because the mean of its divisors is an integer number (431821).

2⁸⁶³⁶⁴¹ is an apocalyptic number.

It is an amenable number.

863641 is a deficient number, since it is larger than the sum of its proper divisors (1).

863641 is an equidigital number, since it uses as much as digits as its factorization.

863641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 863641 is about 929.3228717728. The cubic root of 863641 is about 95.2308696939.

The spelling of 863641 in words is "eight hundred sixty-three thousand, six hundred forty-one".