205977097 has 2 divisors, whose sum is σ = 205977098. Its totient is φ = 205977096.

The previous prime is 205977089. The next prime is 205977173. The reversal of 205977097 is 790779502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118722816 + 87254281 = 10896^2 + 9341^2 .

It is a cyclic number.

It is not a de Polignac number, because 205977097 - 2³ = 205977089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205977007) 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, 102988548 + 102988549.

It is an arithmetic number, because the mean of its divisors is an integer number (102988549).

Almost surely, 2^205977097 is an apocalyptic number.

It is an amenable number.

205977097 is a deficient number, since it is larger than the sum of its proper divisors (1).

205977097 is an equidigital number, since it uses as much as digits as its factorization.

205977097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 277830, while the sum is 46.

The square root of 205977097 is about 14351.9022084182. The cubic root of 205977097 is about 590.5721702119.

The spelling of 205977097 in words is "two hundred five million, nine hundred seventy-seven thousand, ninety-seven".