209155339069 has 2 divisors, whose sum is σ = 209155339070. Its totient is φ = 209155339068.

The previous prime is 209155339067. The next prime is 209155339163. The reversal of 209155339069 is 960933551902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134428556025 + 74726783044 = 366645^2 + 273362^2 .

It is a cyclic number.

It is not a de Polignac number, because 209155339069 - 2¹ = 209155339067 is a prime.

It is a super-2 number, since 2×209155339069² (a number of 23 digits) contains 22 as substring.

Together with 209155339067, 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 (209155339067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104577669534 + 104577669535.

It is an arithmetic number, because the mean of its divisors is an integer number (104577669535).

Almost surely, 2^209155339069 is an apocalyptic number.

It is an amenable number.

209155339069 is a deficient number, since it is larger than the sum of its proper divisors (1).

209155339069 is an equidigital number, since it uses as much as digits as its factorization.

209155339069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1968300, while the sum is 52.

The spelling of 209155339069 in words is "two hundred nine billion, one hundred fifty-five million, three hundred thirty-nine thousand, sixty-nine".