2186999989 has 2 divisors, whose sum is σ = 2186999990. Its totient is φ = 2186999988.

The previous prime is 2186999987. The next prime is 2187000001. The reversal of 2186999989 is 9899996812.

2186999989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1466507025 + 720492964 = 38295^2 + 26842^2 .

It is a cyclic number.

It is not a de Polignac number, because 2186999989 - 2¹ = 2186999987 is a prime.

Together with 2186999987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2186999987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093499994 + 1093499995.

It is an arithmetic number, because the mean of its divisors is an integer number (1093499995).

Almost surely, 2^2186999989 is an apocalyptic number.

It is an amenable number.

2186999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2186999989 is an equidigital number, since it uses as much as digits as its factorization.

2186999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45349632, while the sum is 70.

The square root of 2186999989 is about 46765.3716867513. The cubic root of 2186999989 is about 1298.0246111004.

The spelling of 2186999989 in words is "two billion, one hundred eighty-six million, nine hundred ninety-nine thousand, nine hundred eighty-nine".