209007848869 has 2 divisors, whose sum is σ = 209007848870. Its totient is φ = 209007848868.

The previous prime is 209007848839. The next prime is 209007848879. The reversal of 209007848869 is 968848700902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139674112900 + 69333735969 = 373730^2 + 263313^2 .

It is a cyclic number.

It is not a de Polignac number, because 209007848869 - 2⁵ = 209007848837 is a prime.

It is a super-2 number, since 2×209007848869² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209007848809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104503924434 + 104503924435.

It is an arithmetic number, because the mean of its divisors is an integer number (104503924435).

Almost surely, 2^209007848869 is an apocalyptic number.

It is an amenable number.

209007848869 is a deficient number, since it is larger than the sum of its proper divisors (1).

209007848869 is an equidigital number, since it uses as much as digits as its factorization.

209007848869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13934592, while the sum is 61.

The spelling of 209007848869 in words is "two hundred nine billion, seven million, eight hundred forty-eight thousand, eight hundred sixty-nine".