205140847 has 2 divisors, whose sum is σ = 205140848. Its totient is φ = 205140846.

The previous prime is 205140833. The next prime is 205140883. The reversal of 205140847 is 748041502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205140847 - 2¹¹ = 205138799 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 (205140827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102570423 + 102570424.

It is an arithmetic number, because the mean of its divisors is an integer number (102570424).

Almost surely, 2^205140847 is an apocalyptic number.

205140847 is a deficient number, since it is larger than the sum of its proper divisors (1).

205140847 is an equidigital number, since it uses as much as digits as its factorization.

205140847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 205140847 is about 14322.7388093200. The cubic root of 205140847 is about 589.7718614271.

The spelling of 205140847 in words is "two hundred five million, one hundred forty thousand, eight hundred forty-seven".