205690519 has 2 divisors, whose sum is σ = 205690520. Its totient is φ = 205690518.

The previous prime is 205690489. The next prime is 205690547. The reversal of 205690519 is 915096502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205690519 - 2⁹ = 205690007 is a prime.

It is a super-2 number, since 2×205690519² = 84617179212978722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205690559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102845259 + 102845260.

It is an arithmetic number, because the mean of its divisors is an integer number (102845260).

Almost surely, 2^205690519 is an apocalyptic number.

205690519 is a deficient number, since it is larger than the sum of its proper divisors (1).

205690519 is an equidigital number, since it uses as much as digits as its factorization.

205690519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 205690519 is about 14341.9147605890. The cubic root of 205690519 is about 590.2981534315.

The spelling of 205690519 in words is "two hundred five million, six hundred ninety thousand, five hundred nineteen".