205979671 has 2 divisors, whose sum is σ = 205979672. Its totient is φ = 205979670.

The previous prime is 205979639. The next prime is 205979681. The reversal of 205979671 is 176979502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205979671 - 2⁵ = 205979639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205979611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102989835 + 102989836.

It is an arithmetic number, because the mean of its divisors is an integer number (102989836).

Almost surely, 2^205979671 is an apocalyptic number.

205979671 is a deficient number, since it is larger than the sum of its proper divisors (1).

205979671 is an equidigital number, since it uses as much as digits as its factorization.

205979671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238140, while the sum is 46.

The square root of 205979671 is about 14351.9918826621. The cubic root of 205979671 is about 590.5746302369.

The spelling of 205979671 in words is "two hundred five million, nine hundred seventy-nine thousand, six hundred seventy-one".