865313 has 2 divisors, whose sum is σ = 865314. Its totient is φ = 865312.

The previous prime is 865307. The next prime is 865321. The reversal of 865313 is 313568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559504 + 305809 = 748^2 + 553^2 .

It is a cyclic number.

It is not a de Polignac number, because 865313 - 2⁸ = 865057 is a prime.

It is not a weakly prime, because it can be changed into another prime (865343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432656 + 432657.

It is an arithmetic number, because the mean of its divisors is an integer number (432657).

2⁸⁶⁵³¹³ is an apocalyptic number.

It is an amenable number.

865313 is a deficient number, since it is larger than the sum of its proper divisors (1).

865313 is an equidigital number, since it uses as much as digits as its factorization.

865313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 26.

The square root of 865313 is about 930.2220165100. Note that the first 3 decimals coincide. The cubic root of 865313 is about 95.2922854022.

The spelling of 865313 in words is "eight hundred sixty-five thousand, three hundred thirteen".