204251391 has 12 divisors (see below), whose sum is σ = 297952200. Its totient is φ = 134818800.

The previous prime is 204251353. The next prime is 204251393. The reversal of 204251391 is 193152402.

204251391 is a `hidden beast` number, since 20 + 4 + 251 + 391 = 666.

It is not a de Polignac number, because 204251391 - 2¹¹ = 204249343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204251393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111441 + ... + 113258.

It is an arithmetic number, because the mean of its divisors is an integer number (24829350).

Almost surely, 2^204251391 is an apocalyptic number.

204251391 is a deficient number, since it is larger than the sum of its proper divisors (93700809).

204251391 is a wasteful number, since it uses less digits than its factorization.

204251391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224806 (or 224803 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 204251391 is about 14291.6545928035. The cubic root of 204251391 is about 588.9182428560.

The spelling of 204251391 in words is "two hundred four million, two hundred fifty-one thousand, three hundred ninety-one".