215438694109 has 2 divisors, whose sum is σ = 215438694110. Its totient is φ = 215438694108.

The previous prime is 215438694071. The next prime is 215438694143. The reversal of 215438694109 is 901496834512.

215438694109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131712378084 + 83726316025 = 362922^2 + 289355^2 .

It is a cyclic number.

It is not a de Polignac number, because 215438694109 - 2³³ = 206848759517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215438694199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107719347054 + 107719347055.

It is an arithmetic number, because the mean of its divisors is an integer number (107719347055).

Almost surely, 2^215438694109 is an apocalyptic number.

It is an amenable number.

215438694109 is a deficient number, since it is larger than the sum of its proper divisors (1).

215438694109 is an equidigital number, since it uses as much as digits as its factorization.

215438694109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 215438694109 in words is "two hundred fifteen billion, four hundred thirty-eight million, six hundred ninety-four thousand, one hundred nine".