2158354909 has 2 divisors, whose sum is σ = 2158354910. Its totient is φ = 2158354908.

The previous prime is 2158354879. The next prime is 2158354963. The reversal of 2158354909 is 9094538512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1790559225 + 367795684 = 42315^2 + 19178^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158354909 - 2¹³ = 2158346717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158354309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079177454 + 1079177455.

It is an arithmetic number, because the mean of its divisors is an integer number (1079177455).

Almost surely, 2^2158354909 is an apocalyptic number.

It is an amenable number.

2158354909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158354909 is an equidigital number, since it uses as much as digits as its factorization.

2158354909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 2158354909 is about 46458.0984221266. The cubic root of 2158354909 is about 1292.3325601966.

The spelling of 2158354909 in words is "two billion, one hundred fifty-eight million, three hundred fifty-four thousand, nine hundred nine".