208191136 has 12 divisors (see below), whose sum is σ = 409876362. Its totient is φ = 104095552.

The previous prime is 208191131. The next prime is 208191157. The reversal of 208191136 is 631191802.

It can be written as a sum of positive squares in only one way, i.e., 136890000 + 71301136 = 11700^2 + 8444^2 .

It is a junction number, because it is equal to n+sod(n) for n = 208191098 and 208191107.

It is not an unprimeable number, because it can be changed into a prime (208191131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3252955 + ... + 3253018.

Almost surely, 2^208191136 is an apocalyptic number.

It is an amenable number.

208191136 is a deficient number, since it is larger than the sum of its proper divisors (201685226).

208191136 is an equidigital number, since it uses as much as digits as its factorization.

208191136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6505983 (or 6505975 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 208191136 is about 14428.8300288000. The cubic root of 208191136 is about 592.6806451858.

The spelling of 208191136 in words is "two hundred eight million, one hundred ninety-one thousand, one hundred thirty-six".