205011019 has 2 divisors, whose sum is σ = 205011020. Its totient is φ = 205011018.

The previous prime is 205011013. The next prime is 205011031. The reversal of 205011019 is 910110502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205011019 - 2⁵ = 205010987 is a prime.

It is a super-2 number, since 2×205011019² = 84059035822836722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 205010987 and 205011005.

It is not a weakly prime, because it can be changed into another prime (205011013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102505509 + 102505510.

It is an arithmetic number, because the mean of its divisors is an integer number (102505510).

Almost surely, 2^205011019 is an apocalyptic number.

205011019 is a deficient number, since it is larger than the sum of its proper divisors (1).

205011019 is an equidigital number, since it uses as much as digits as its factorization.

205011019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 205011019 is about 14318.2058582771. The cubic root of 205011019 is about 589.6474183744.

The spelling of 205011019 in words is "two hundred five million, eleven thousand, nineteen".