205462139 has 2 divisors, whose sum is σ = 205462140. Its totient is φ = 205462138.

The previous prime is 205462121. The next prime is 205462163. The reversal of 205462139 is 931264502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205462139 - 2²⁰ = 204413563 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205462339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102731069 + 102731070.

It is an arithmetic number, because the mean of its divisors is an integer number (102731070).

Almost surely, 2^205462139 is an apocalyptic number.

205462139 is a deficient number, since it is larger than the sum of its proper divisors (1).

205462139 is an equidigital number, since it uses as much as digits as its factorization.

205462139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 205462139 is about 14333.9505719812. The cubic root of 205462139 is about 590.0796014403.

The spelling of 205462139 in words is "two hundred five million, four hundred sixty-two thousand, one hundred thirty-nine".