205912797 has 4 divisors (see below), whose sum is σ = 274550400. Its totient is φ = 137275196.

The previous prime is 205912787. The next prime is 205912799. The reversal of 205912797 is 797219502.

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 205912797 - 2¹⁶ = 205847261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205912799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34318797 + ... + 34318802.

It is an arithmetic number, because the mean of its divisors is an integer number (68637600).

Almost surely, 2^205912797 is an apocalyptic number.

It is an amenable number.

205912797 is a deficient number, since it is larger than the sum of its proper divisors (68637603).

205912797 is an equidigital number, since it uses as much as digits as its factorization.

205912797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68637602.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 205912797 is about 14349.6619123936. The cubic root of 205912797 is about 590.5107107208.

The spelling of 205912797 in words is "two hundred five million, nine hundred twelve thousand, seven hundred ninety-seven".