816506087 has 2 divisors, whose sum is σ = 816506088. Its totient is φ = 816506086.

The previous prime is 816506083. The next prime is 816506123. The reversal of 816506087 is 780605618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816506087 - 2² = 816506083 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816506081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408253043 + 408253044.

It is an arithmetic number, because the mean of its divisors is an integer number (408253044).

Almost surely, 2^816506087 is an apocalyptic number.

816506087 is a deficient number, since it is larger than the sum of its proper divisors (1).

816506087 is an equidigital number, since it uses as much as digits as its factorization.

816506087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 816506087 is about 28574.5706354444. The cubic root of 816506087 is about 934.6588924154.

The spelling of 816506087 in words is "eight hundred sixteen million, five hundred six thousand, eighty-seven".