816587 has 2 divisors, whose sum is σ = 816588. Its totient is φ = 816586.

The previous prime is 816581. The next prime is 816589. The reversal of 816587 is 785618.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816587 - 2¹² = 812491 is a prime.

Together with 816589, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (816581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408293 + 408294.

It is an arithmetic number, because the mean of its divisors is an integer number (408294).

2⁸¹⁶⁵⁸⁷ is an apocalyptic number.

816587 is a deficient number, since it is larger than the sum of its proper divisors (1).

816587 is an equidigital number, since it uses as much as digits as its factorization.

816587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 35.

The square root of 816587 is about 903.6520348010. The cubic root of 816587 is about 93.4689765244.

The spelling of 816587 in words is "eight hundred sixteen thousand, five hundred eighty-seven".