205961879 has 2 divisors, whose sum is σ = 205961880. Its totient is φ = 205961878.

The previous prime is 205961837. The next prime is 205961893. The reversal of 205961879 is 978169502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205961879 - 2¹⁶ = 205896343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205961809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102980939 + 102980940.

It is an arithmetic number, because the mean of its divisors is an integer number (102980940).

Almost surely, 2^205961879 is an apocalyptic number.

205961879 is a deficient number, since it is larger than the sum of its proper divisors (1).

205961879 is an equidigital number, since it uses as much as digits as its factorization.

205961879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 205961879 is about 14351.3720250017. The cubic root of 205961879 is about 590.5576256359.

The spelling of 205961879 in words is "two hundred five million, nine hundred sixty-one thousand, eight hundred seventy-nine".