865537 has 2 divisors, whose sum is σ = 865538. Its totient is φ = 865536.

The previous prime is 865511. The next prime is 865577. The reversal of 865537 is 735568.

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., 461041 + 404496 = 679^2 + 636^2 .

It is a cyclic number.

It is not a de Polignac number, because 865537 - 2⁷ = 865409 is a prime.

It is not a weakly prime, because it can be changed into another prime (865577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432768 + 432769.

It is an arithmetic number, because the mean of its divisors is an integer number (432769).

2⁸⁶⁵⁵³⁷ is an apocalyptic number.

It is an amenable number.

865537 is a deficient number, since it is larger than the sum of its proper divisors (1).

865537 is an equidigital number, since it uses as much as digits as its factorization.

865537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 34.

The square root of 865537 is about 930.3424100835. The cubic root of 865537 is about 95.3005073328.

The spelling of 865537 in words is "eight hundred sixty-five thousand, five hundred thirty-seven".