863609 has 2 divisors, whose sum is σ = 863610. Its totient is φ = 863608.

The previous prime is 863593. The next prime is 863633. The reversal of 863609 is 906368.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 469225 + 394384 = 685^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 863609 - 2⁴ = 863593 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431804 + 431805.

It is an arithmetic number, because the mean of its divisors is an integer number (431805).

2⁸⁶³⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

863609 is a deficient number, since it is larger than the sum of its proper divisors (1).

863609 is an equidigital number, since it uses as much as digits as its factorization.

863609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 863609 is about 929.3056547767. The cubic root of 863609 is about 95.2296935009.

The spelling of 863609 in words is "eight hundred sixty-three thousand, six hundred nine".