209454335813 has 2 divisors, whose sum is σ = 209454335814. Its totient is φ = 209454335812.

The previous prime is 209454335807. The next prime is 209454335833. The reversal of 209454335813 is 318533454902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134001387844 + 75452947969 = 366062^2 + 274687^2 .

It is a cyclic number.

It is not a de Polignac number, because 209454335813 - 2⁸ = 209454335557 is a prime.

It is a super-2 number, since 2×209454335813² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209454335833) 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, 104727167906 + 104727167907.

It is an arithmetic number, because the mean of its divisors is an integer number (104727167907).

Almost surely, 2^209454335813 is an apocalyptic number.

It is an amenable number.

209454335813 is a deficient number, since it is larger than the sum of its proper divisors (1).

209454335813 is an equidigital number, since it uses as much as digits as its factorization.

209454335813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 209454335813 in words is "two hundred nine billion, four hundred fifty-four million, three hundred thirty-five thousand, eight hundred thirteen".