2185705999 has 2 divisors, whose sum is σ = 2185706000. Its totient is φ = 2185705998.

The previous prime is 2185705993. The next prime is 2185706027. The reversal of 2185705999 is 9995075812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2185705999 - 2⁵ = 2185705967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2185705993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1092852999 + 1092853000.

It is an arithmetic number, because the mean of its divisors is an integer number (1092853000).

Almost surely, 2^2185705999 is an apocalyptic number.

2185705999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2185705999 is an equidigital number, since it uses as much as digits as its factorization.

2185705999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 55.

The square root of 2185705999 is about 46751.5347234719. The cubic root of 2185705999 is about 1297.7685583267.

The spelling of 2185705999 in words is "two billion, one hundred eighty-five million, seven hundred five thousand, nine hundred ninety-nine".