209080987 has 2 divisors, whose sum is σ = 209080988. Its totient is φ = 209080986.

The previous prime is 209080967. The next prime is 209081021. The reversal of 209080987 is 789080902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209080987 - 2²⁷ = 74863259 is a prime.

It is not a weakly prime, because it can be changed into another prime (209080967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104540493 + 104540494.

It is an arithmetic number, because the mean of its divisors is an integer number (104540494).

Almost surely, 2^209080987 is an apocalyptic number.

209080987 is a deficient number, since it is larger than the sum of its proper divisors (1).

209080987 is an equidigital number, since it uses as much as digits as its factorization.

209080987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 209080987 is about 14459.6330174732. The cubic root of 209080987 is about 593.5238572664.

The spelling of 209080987 in words is "two hundred nine million, eighty thousand, nine hundred eighty-seven".