209479226443 has 2 divisors, whose sum is σ = 209479226444. Its totient is φ = 209479226442.

The previous prime is 209479226389. The next prime is 209479226471. The reversal of 209479226443 is 344622974902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209479226443 - 2²⁵ = 209445672011 is a prime.

It is a super-2 number, since 2×209479226443² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (209479226483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104739613221 + 104739613222.

It is an arithmetic number, because the mean of its divisors is an integer number (104739613222).

Almost surely, 2^209479226443 is an apocalyptic number.

209479226443 is a deficient number, since it is larger than the sum of its proper divisors (1).

209479226443 is an equidigital number, since it uses as much as digits as its factorization.

209479226443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 52.

The spelling of 209479226443 in words is "two hundred nine billion, four hundred seventy-nine million, two hundred twenty-six thousand, four hundred forty-three".