208045981 has 16 divisors (see below), whose sum is σ = 244839168. Its totient is φ = 174283200.

The previous prime is 208045979. The next prime is 208046009. The reversal of 208045981 is 189540802.

It is not a de Polignac number, because 208045981 - 2¹ = 208045979 is a prime.

It is a super-2 number, since 2×208045981² = 86566260420504722, which contains 22 as substring.

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 208045981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208045951) 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, 129475 + ... + 131071.

It is an arithmetic number, because the mean of its divisors is an integer number (15302448).

Almost surely, 2^208045981 is an apocalyptic number.

It is an amenable number.

208045981 is a deficient number, since it is larger than the sum of its proper divisors (36793187).

208045981 is a wasteful number, since it uses less digits than its factorization.

208045981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2532.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 208045981 is about 14423.7991181242. The cubic root of 208045981 is about 592.5428702505.

The spelling of 208045981 in words is "two hundred eight million, forty-five thousand, nine hundred eighty-one".