209255704549 has 2 divisors, whose sum is σ = 209255704550. Its totient is φ = 209255704548.

The previous prime is 209255704543. The next prime is 209255704577. The reversal of 209255704549 is 945407552902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178003829025 + 31251875524 = 421905^2 + 176782^2 .

It is a cyclic number.

It is not a de Polignac number, because 209255704549 - 2⁵ = 209255704517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209255704496 and 209255704505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209255704543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104627852274 + 104627852275.

It is an arithmetic number, because the mean of its divisors is an integer number (104627852275).

Almost surely, 2^209255704549 is an apocalyptic number.

It is an amenable number.

209255704549 is a deficient number, since it is larger than the sum of its proper divisors (1).

209255704549 is an equidigital number, since it uses as much as digits as its factorization.

209255704549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536000, while the sum is 52.

The spelling of 209255704549 in words is "two hundred nine billion, two hundred fifty-five million, seven hundred four thousand, five hundred forty-nine".