208891011 has 16 divisors (see below), whose sum is σ = 326914304. Its totient is φ = 116139744.

The previous prime is 208890977. The next prime is 208891021. The reversal of 208891011 is 110198802.

208891011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 208891011 - 2¹³ = 208882819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 208891011.

It is not an unprimeable number, because it can be changed into a prime (208891021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133645 + ... + 135198.

It is an arithmetic number, because the mean of its divisors is an integer number (20432144).

Almost surely, 2^208891011 is an apocalyptic number.

208891011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

208891011 is a deficient number, since it is larger than the sum of its proper divisors (118023293).

208891011 is a wasteful number, since it uses less digits than its factorization.

208891011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268890.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 208891011 is about 14453.0623398642. The cubic root of 208891011 is about 593.3440394553.

The spelling of 208891011 in words is "two hundred eight million, eight hundred ninety-one thousand, eleven".