2158279309 has 2 divisors, whose sum is σ = 2158279310. Its totient is φ = 2158279308.

The previous prime is 2158279199. The next prime is 2158279327. The reversal of 2158279309 is 9039728512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1880956900 + 277322409 = 43370^2 + 16653^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158279309 - 2¹³ = 2158271117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158279399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079139654 + 1079139655.

It is an arithmetic number, because the mean of its divisors is an integer number (1079139655).

Almost surely, 2^2158279309 is an apocalyptic number.

It is an amenable number.

2158279309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158279309 is an equidigital number, since it uses as much as digits as its factorization.

2158279309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 2158279309 is about 46457.2847786007. The cubic root of 2158279309 is about 1292.3174713154.

The spelling of 2158279309 in words is "two billion, one hundred fifty-eight million, two hundred seventy-nine thousand, three hundred nine".