205120849243 has 2 divisors, whose sum is σ = 205120849244. Its totient is φ = 205120849242.

The previous prime is 205120849169. The next prime is 205120849247. The reversal of 205120849243 is 342948021502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205120849243 - 2¹⁷ = 205120718171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205120849196 and 205120849205.

It is not a weakly prime, because it can be changed into another prime (205120849247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102560424621 + 102560424622.

It is an arithmetic number, because the mean of its divisors is an integer number (102560424622).

Almost surely, 2^205120849243 is an apocalyptic number.

205120849243 is a deficient number, since it is larger than the sum of its proper divisors (1).

205120849243 is an equidigital number, since it uses as much as digits as its factorization.

205120849243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 205120849243 in words is "two hundred five billion, one hundred twenty million, eight hundred forty-nine thousand, two hundred forty-three".