205971457 has 4 divisors (see below), whose sum is σ = 216812080. Its totient is φ = 195130836.

The previous prime is 205971443. The next prime is 205971481. The reversal of 205971457 is 754179502.

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 not a de Polignac number, because 205971457 - 2⁷ = 205971329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205971487) 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, 5420283 + ... + 5420320.

It is an arithmetic number, because the mean of its divisors is an integer number (54203020).

Almost surely, 2^205971457 is an apocalyptic number.

It is an amenable number.

205971457 is a deficient number, since it is larger than the sum of its proper divisors (10840623).

205971457 is a wasteful number, since it uses less digits than its factorization.

205971457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10840622.

The product of its (nonzero) digits is 88200, while the sum is 40.

The square root of 205971457 is about 14351.7057174400. The cubic root of 205971457 is about 590.5667798757.

The spelling of 205971457 in words is "two hundred five million, nine hundred seventy-one thousand, four hundred fifty-seven".