209312407 has 2 divisors, whose sum is σ = 209312408. Its totient is φ = 209312406.

The previous prime is 209312393. The next prime is 209312413. The reversal of 209312407 is 704213902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209312407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209312107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104656203 + 104656204.

It is an arithmetic number, because the mean of its divisors is an integer number (104656204).

Almost surely, 2^209312407 is an apocalyptic number.

209312407 is a deficient number, since it is larger than the sum of its proper divisors (1).

209312407 is an equidigital number, since it uses as much as digits as its factorization.

209312407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 209312407 is about 14467.6330821596. The cubic root of 209312407 is about 593.7427559301.

The spelling of 209312407 in words is "two hundred nine million, three hundred twelve thousand, four hundred seven".