205371997 has 8 divisors (see below), whose sum is σ = 213467040. Its totient is φ = 197344560.

The previous prime is 205371949. The next prime is 205372001. The reversal of 205371997 is 799173502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205371997 - 2¹⁵ = 205339229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205371097) 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 7 ways as a sum of consecutive naturals, for example, 10663 + ... + 22900.

It is an arithmetic number, because the mean of its divisors is an integer number (26683380).

Almost surely, 2^205371997 is an apocalyptic number.

It is an amenable number.

205371997 is a deficient number, since it is larger than the sum of its proper divisors (8095043).

205371997 is a wasteful number, since it uses less digits than its factorization.

205371997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33803.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 205371997 is about 14330.8058740603. The cubic root of 205371997 is about 589.9932939964.

The spelling of 205371997 in words is "two hundred five million, three hundred seventy-one thousand, nine hundred ninety-seven".