208840591 has 2 divisors, whose sum is σ = 208840592. Its totient is φ = 208840590.

The previous prime is 208840573. The next prime is 208840627. The reversal of 208840591 is 195048802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208840591 - 2⁵ = 208840559 is a prime.

It is a super-2 number, since 2×208840591² = 87228784898458562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 208840591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208840531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104420295 + 104420296.

It is an arithmetic number, because the mean of its divisors is an integer number (104420296).

Almost surely, 2^208840591 is an apocalyptic number.

208840591 is a deficient number, since it is larger than the sum of its proper divisors (1).

208840591 is an equidigital number, since it uses as much as digits as its factorization.

208840591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 208840591 is about 14451.3179675765. The cubic root of 208840591 is about 593.2962971524.

The spelling of 208840591 in words is "two hundred eight million, eight hundred forty thousand, five hundred ninety-one".