205240097 has 4 divisors (see below), whose sum is σ = 205523136. Its totient is φ = 204957060.

The previous prime is 205240093. The next prime is 205240121. The reversal of 205240097 is 790042502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205240097 - 2² = 205240093 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205240093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140429 + ... + 141882.

It is an arithmetic number, because the mean of its divisors is an integer number (51380784).

Almost surely, 2^205240097 is an apocalyptic number.

It is an amenable number.

205240097 is a deficient number, since it is larger than the sum of its proper divisors (283039).

205240097 is an equidigital number, since it uses as much as digits as its factorization.

205240097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283038.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 205240097 is about 14326.2031606424. The cubic root of 205240097 is about 589.8669593735.

Adding to 205240097 its reverse (790042502), we get a palindrome (995282599).

The spelling of 205240097 in words is "two hundred five million, two hundred forty thousand, ninety-seven".