208163081 has 4 divisors (see below), whose sum is σ = 237900672. Its totient is φ = 178425492.

The previous prime is 208163071. The next prime is 208163083. The reversal of 208163081 is 180361802.

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, and also an emirpimes, since its reverse is a distinct semiprime: 180361802 = 2 ⋅90180901.

It is not a de Polignac number, because 208163081 - 2⁶ = 208163017 is a prime.

It is a super-2 number, since 2×208163081² = 86663736582825122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208163083) 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, 14868785 + ... + 14868798.

It is an arithmetic number, because the mean of its divisors is an integer number (59475168).

Almost surely, 2^208163081 is an apocalyptic number.

It is an amenable number.

208163081 is a deficient number, since it is larger than the sum of its proper divisors (29737591).

208163081 is an equidigital number, since it uses as much as digits as its factorization.

208163081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29737590.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 208163081 is about 14427.8578104998. The cubic root of 208163081 is about 592.6540215700.

The spelling of 208163081 in words is "two hundred eight million, one hundred sixty-three thousand, eighty-one".