860219999 has 2 divisors, whose sum is σ = 860220000. Its totient is φ = 860219998.

The previous prime is 860219981. The next prime is 860220001. The reversal of 860219999 is 999912068.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-860219999 is a prime.

It is a Sophie Germain prime.

Together with 860220001, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 860219999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (860219099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430109999 + 430110000.

It is an arithmetic number, because the mean of its divisors is an integer number (430110000).

Almost surely, 2^860219999 is an apocalyptic number.

860219999 is a deficient number, since it is larger than the sum of its proper divisors (1).

860219999 is an equidigital number, since it uses as much as digits as its factorization.

860219999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 53.

The square root of 860219999 is about 29329.5073091929. The cubic root of 860219999 is about 951.0496243643.

The spelling of 860219999 in words is "eight hundred sixty million, two hundred nineteen thousand, nine hundred ninety-nine".