208891243 has 4 divisors (see below), whose sum is σ = 227881368. Its totient is φ = 189901120.

The previous prime is 208891231. The next prime is 208891253. The reversal of 208891243 is 342198802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 208891243 - 2¹⁷ = 208760171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (208891213) 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, 9495046 + ... + 9495067.

It is an arithmetic number, because the mean of its divisors is an integer number (56970342).

Almost surely, 2^208891243 is an apocalyptic number.

208891243 is a deficient number, since it is larger than the sum of its proper divisors (18990125).

208891243 is a wasteful number, since it uses less digits than its factorization.

208891243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18990124.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 208891243 is about 14453.0703658427. The cubic root of 208891243 is about 593.3442591165.

The spelling of 208891243 in words is "two hundred eight million, eight hundred ninety-one thousand, two hundred forty-three".