208851891 has 8 divisors (see below), whose sum is σ = 290576640. Its totient is φ = 133180872.

The previous prime is 208851889. The next prime is 208851899. The reversal of 208851891 is 198158802.

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

It is not a de Polignac number, because 208851891 - 2¹ = 208851889 is a prime.

It is a super-2 number, since 2×208851891² = 87238224748551762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (208851899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1513351 + ... + 1513488.

It is an arithmetic number, because the mean of its divisors is an integer number (36322080).

Almost surely, 2^208851891 is an apocalyptic number.

208851891 is a deficient number, since it is larger than the sum of its proper divisors (81724749).

208851891 is a wasteful number, since it uses less digits than its factorization.

208851891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3026865.

The product of its (nonzero) digits is 46080, while the sum is 42.

The square root of 208851891 is about 14451.7089300885. The cubic root of 208851891 is about 593.3069977019.

The spelling of 208851891 in words is "two hundred eight million, eight hundred fifty-one thousand, eight hundred ninety-one".