816539 has 2 divisors, whose sum is σ = 816540. Its totient is φ = 816538.

The previous prime is 816521. The next prime is 816547. The reversal of 816539 is 935618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816539 - 2¹² = 812443 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (816559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408269 + 408270.

It is an arithmetic number, because the mean of its divisors is an integer number (408270).

2⁸¹⁶⁵³⁹ is an apocalyptic number.

816539 is a deficient number, since it is larger than the sum of its proper divisors (1).

816539 is an equidigital number, since it uses as much as digits as its factorization.

816539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 816539 is about 903.6254755152. The cubic root of 816539 is about 93.4671450809.

The spelling of 816539 in words is "eight hundred sixteen thousand, five hundred thirty-nine".