208948991 has 2 divisors, whose sum is σ = 208948992. Its totient is φ = 208948990.

The previous prime is 208948969. The next prime is 208949003. The reversal of 208948991 is 199849802.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 208948991 - 2²² = 204754687 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208948591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104474495 + 104474496.

It is an arithmetic number, because the mean of its divisors is an integer number (104474496).

Almost surely, 2^208948991 is an apocalyptic number.

208948991 is a deficient number, since it is larger than the sum of its proper divisors (1).

208948991 is an equidigital number, since it uses as much as digits as its factorization.

208948991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 208948991 is about 14455.0680039908. The cubic root of 208948991 is about 593.3989307673.

The spelling of 208948991 in words is "two hundred eight million, nine hundred forty-eight thousand, nine hundred ninety-one".