205391519 has 2 divisors, whose sum is σ = 205391520. Its totient is φ = 205391518.

The previous prime is 205391503. The next prime is 205391531. The reversal of 205391519 is 915193502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205391519 - 2⁴ = 205391503 is a prime.

It is a super-2 number, since 2×205391519² = 84371352154254722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205391419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102695759 + 102695760.

It is an arithmetic number, because the mean of its divisors is an integer number (102695760).

Almost surely, 2^205391519 is an apocalyptic number.

205391519 is a deficient number, since it is larger than the sum of its proper divisors (1).

205391519 is an equidigital number, since it uses as much as digits as its factorization.

205391519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 205391519 is about 14331.4869779796. The cubic root of 205391519 is about 590.0119876909.

The spelling of 205391519 in words is "two hundred five million, three hundred ninety-one thousand, five hundred nineteen".