85816399 has 2 divisors, whose sum is σ = 85816400. Its totient is φ = 85816398.

The previous prime is 85816373. The next prime is 85816411. The reversal of 85816399 is 99361858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85816399 - 2⁷ = 85816271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85816309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42908199 + 42908200.

It is an arithmetic number, because the mean of its divisors is an integer number (42908200).

Almost surely, 2^85816399 is an apocalyptic number.

85816399 is a deficient number, since it is larger than the sum of its proper divisors (1).

85816399 is an equidigital number, since it uses as much as digits as its factorization.

85816399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 49.

The square root of 85816399 is about 9263.7141039650. The cubic root of 85816399 is about 441.0861578226.

The spelling of 85816399 in words is "eighty-five million, eight hundred sixteen thousand, three hundred ninety-nine".