209087423 has 2 divisors, whose sum is σ = 209087424. Its totient is φ = 209087422.

The previous prime is 209087393. The next prime is 209087429. The reversal of 209087423 is 324780902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209087423 - 2¹⁴ = 209071039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209087429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104543711 + 104543712.

It is an arithmetic number, because the mean of its divisors is an integer number (104543712).

Almost surely, 2^209087423 is an apocalyptic number.

209087423 is a deficient number, since it is larger than the sum of its proper divisors (1).

209087423 is an equidigital number, since it uses as much as digits as its factorization.

209087423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 209087423 is about 14459.8555663603. The cubic root of 209087423 is about 593.5299472197.

The spelling of 209087423 in words is "two hundred nine million, eighty-seven thousand, four hundred twenty-three".