208266101 has 4 divisors (see below), whose sum is σ = 213345804. Its totient is φ = 203186400.

The previous prime is 208266089. The next prime is 208266109. The reversal of 208266101 is 101662802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101662802 = 2 ⋅50831401.

It can be written as a sum of positive squares in 2 ways, for example, as 115047076 + 93219025 = 10726^2 + 9655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208266101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208266109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2539790 + ... + 2539871.

It is an arithmetic number, because the mean of its divisors is an integer number (53336451).

Almost surely, 2^208266101 is an apocalyptic number.

It is an amenable number.

208266101 is a deficient number, since it is larger than the sum of its proper divisors (5079703).

208266101 is an equidigital number, since it uses as much as digits as its factorization.

208266101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5079702.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 208266101 is about 14431.4275454648. The cubic root of 208266101 is about 592.7517736909.

The spelling of 208266101 in words is "two hundred eight million, two hundred sixty-six thousand, one hundred one".