205438669 has 2 divisors, whose sum is σ = 205438670. Its totient is φ = 205438668.

The previous prime is 205438661. The next prime is 205438679. The reversal of 205438669 is 966834502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190716100 + 14722569 = 13810^2 + 3837^2 .

It is a cyclic number.

It is not a de Polignac number, because 205438669 - 2³ = 205438661 is a prime.

It is a super-2 number, since 2×205438669² = 84410093440983122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205438661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102719334 + 102719335.

It is an arithmetic number, because the mean of its divisors is an integer number (102719335).

Almost surely, 2^205438669 is an apocalyptic number.

It is an amenable number.

205438669 is a deficient number, since it is larger than the sum of its proper divisors (1).

205438669 is an equidigital number, since it uses as much as digits as its factorization.

205438669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 205438669 is about 14333.1318629251. The cubic root of 205438669 is about 590.0571322631.

The spelling of 205438669 in words is "two hundred five million, four hundred thirty-eight thousand, six hundred sixty-nine".