208528861 has 4 divisors (see below), whose sum is σ = 209464192. Its totient is φ = 207593532.

The previous prime is 208528799. The next prime is 208528883. The reversal of 208528861 is 168825802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208528861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208228861) 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, 467331 + ... + 467776.

It is an arithmetic number, because the mean of its divisors is an integer number (52366048).

Almost surely, 2^208528861 is an apocalyptic number.

It is an amenable number.

208528861 is a deficient number, since it is larger than the sum of its proper divisors (935331).

208528861 is an equidigital number, since it uses as much as digits as its factorization.

208528861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935330.

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 208528861 is about 14440.5284183094. The cubic root of 208528861 is about 593.0009517051. Note that the first 3 decimals are identical.

The spelling of 208528861 in words is "two hundred eight million, five hundred twenty-eight thousand, eight hundred sixty-one".