205139329 has 2 divisors, whose sum is σ = 205139330. Its totient is φ = 205139328.

The previous prime is 205139299. The next prime is 205139339. The reversal of 205139329 is 923931502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145154304 + 59985025 = 12048^2 + 7745^2 .

It is a cyclic number.

It is not a de Polignac number, because 205139329 - 2¹³ = 205131137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205139294 and 205139303.

It is not a weakly prime, because it can be changed into another prime (205139339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102569664 + 102569665.

It is an arithmetic number, because the mean of its divisors is an integer number (102569665).

Almost surely, 2^205139329 is an apocalyptic number.

It is an amenable number.

205139329 is a deficient number, since it is larger than the sum of its proper divisors (1).

205139329 is an equidigital number, since it uses as much as digits as its factorization.

205139329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 205139329 is about 14322.6858165639. The cubic root of 205139329 is about 589.7704066934.

The spelling of 205139329 in words is "two hundred five million, one hundred thirty-nine thousand, three hundred twenty-nine".