208749091 has 2 divisors, whose sum is σ = 208749092. Its totient is φ = 208749090.

The previous prime is 208749089. The next prime is 208749113. The reversal of 208749091 is 190947802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208749091 - 2¹ = 208749089 is a prime.

Together with 208749089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (208749041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104374545 + 104374546.

It is an arithmetic number, because the mean of its divisors is an integer number (104374546).

Almost surely, 2^208749091 is an apocalyptic number.

208749091 is a deficient number, since it is larger than the sum of its proper divisors (1).

208749091 is an equidigital number, since it uses as much as digits as its factorization.

208749091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 208749091 is about 14448.1518195235. The cubic root of 208749091 is about 593.2096368898.

The spelling of 208749091 in words is "two hundred eight million, seven hundred forty-nine thousand, ninety-one".