208944134969 has 2 divisors, whose sum is σ = 208944134970. Its totient is φ = 208944134968.

The previous prime is 208944134941. The next prime is 208944134977. The reversal of 208944134969 is 969431449802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181507525369 + 27436609600 = 426037^2 + 165640^2 .

It is a cyclic number.

It is not a de Polignac number, because 208944134969 - 2⁸ = 208944134713 is a prime.

It is a super-2 number, since 2×208944134969² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (208944134369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104472067484 + 104472067485.

It is an arithmetic number, because the mean of its divisors is an integer number (104472067485).

Almost surely, 2^208944134969 is an apocalyptic number.

It is an amenable number.

208944134969 is a deficient number, since it is larger than the sum of its proper divisors (1).

208944134969 is an equidigital number, since it uses as much as digits as its factorization.

208944134969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13436928, while the sum is 59.

The spelling of 208944134969 in words is "two hundred eight billion, nine hundred forty-four million, one hundred thirty-four thousand, nine hundred sixty-nine".