205251239 has 2 divisors, whose sum is σ = 205251240. Its totient is φ = 205251238.

The previous prime is 205251229. The next prime is 205251259. The reversal of 205251239 is 932152502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205251239 - 2¹² = 205247143 is a prime.

It is a super-2 number, since 2×205251239² = 84256142222070242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205251229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102625619 + 102625620.

It is an arithmetic number, because the mean of its divisors is an integer number (102625620).

Almost surely, 2^205251239 is an apocalyptic number.

205251239 is a deficient number, since it is larger than the sum of its proper divisors (1).

205251239 is an equidigital number, since it uses as much as digits as its factorization.

205251239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 205251239 is about 14326.5920232273. The cubic root of 205251239 is about 589.8776333415.

The spelling of 205251239 in words is "two hundred five million, two hundred fifty-one thousand, two hundred thirty-nine".