205102889 has 2 divisors, whose sum is σ = 205102890. Its totient is φ = 205102888.

The previous prime is 205102871. The next prime is 205102897. The reversal of 205102889 is 988201502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159769600 + 45333289 = 12640^2 + 6733^2 .

It is a cyclic number.

It is not a de Polignac number, because 205102889 - 2¹² = 205098793 is a prime.

It is a super-2 number, since 2×205102889² = 84134390152292642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205102189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102551444 + 102551445.

It is an arithmetic number, because the mean of its divisors is an integer number (102551445).

Almost surely, 2^205102889 is an apocalyptic number.

It is an amenable number.

205102889 is a deficient number, since it is larger than the sum of its proper divisors (1).

205102889 is an equidigital number, since it uses as much as digits as its factorization.

205102889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 205102889 is about 14321.4136522901. The cubic root of 205102889 is about 589.7354832646.

The spelling of 205102889 in words is "two hundred five million, one hundred two thousand, eight hundred eighty-nine".