861361 has 2 divisors, whose sum is σ = 861362. Its totient is φ = 861360.

The previous prime is 861353. The next prime is 861391. The reversal of 861361 is 163168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664225 + 197136 = 815^2 + 444^2 .

It is a cyclic number.

It is not a de Polignac number, because 861361 - 2³ = 861353 is a prime.

It is not a weakly prime, because it can be changed into another prime (861391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430680 + 430681.

It is an arithmetic number, because the mean of its divisors is an integer number (430681).

2⁸⁶¹³⁶¹ is an apocalyptic number.

It is an amenable number.

861361 is a deficient number, since it is larger than the sum of its proper divisors (1).

861361 is an equidigital number, since it uses as much as digits as its factorization.

861361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 861361 is about 928.0953614796. The cubic root of 861361 is about 95.1469931241.

The spelling of 861361 in words is "eight hundred sixty-one thousand, three hundred sixty-one".