205070869 has 2 divisors, whose sum is σ = 205070870. Its totient is φ = 205070868.

The previous prime is 205070867. The next prime is 205070911. The reversal of 205070869 is 968070502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192182769 + 12888100 = 13863^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 205070869 - 2¹ = 205070867 is a prime.

It is a super-2 number, since 2×205070869² = 84108122624830322, which contains 22 as substring.

Together with 205070867, 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 (205070867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102535434 + 102535435.

It is an arithmetic number, because the mean of its divisors is an integer number (102535435).

Almost surely, 2^205070869 is an apocalyptic number.

It is an amenable number.

205070869 is a deficient number, since it is larger than the sum of its proper divisors (1).

205070869 is an equidigital number, since it uses as much as digits as its factorization.

205070869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 205070869 is about 14320.2957022542. The cubic root of 205070869 is about 589.7047924683.

The spelling of 205070869 in words is "two hundred five million, seventy thousand, eight hundred sixty-nine".