2158999 has 2 divisors, whose sum is σ = 2159000. Its totient is φ = 2158998.

The previous prime is 2158993. The next prime is 2159023. The reversal of 2158999 is 9998512.

2158999 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2158999 is a prime.

It is a super-2 number, since 2×2158999² = 9322553364002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079499 + 1079500.

It is an arithmetic number, because the mean of its divisors is an integer number (1079500).

2^2158999 is an apocalyptic number.

2158999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158999 is an equidigital number, since it uses as much as digits as its factorization.

2158999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 43.

The square root of 2158999 is about 1469.3532590905. The cubic root of 2158999 is about 129.2461098987.

The spelling of 2158999 in words is "two million, one hundred fifty-eight thousand, nine hundred ninety-nine".