43209872273 has 2 divisors, whose sum is σ = 43209872274. Its totient is φ = 43209872272.

The previous prime is 43209872249. The next prime is 43209872309. The reversal of 43209872273 is 37227890234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42614170624 + 595701649 = 206432^2 + 24407^2 .

It is a cyclic number.

It is not a de Polignac number, because 43209872273 - 2¹⁰ = 43209871249 is a prime.

It is not a weakly prime, because it can be changed into another prime (43209872203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21604936136 + 21604936137.

It is an arithmetic number, because the mean of its divisors is an integer number (21604936137).

Almost surely, 2^43209872273 is an apocalyptic number.

It is an amenable number.

43209872273 is a deficient number, since it is larger than the sum of its proper divisors (1).

43209872273 is an equidigital number, since it uses as much as digits as its factorization.

43209872273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 47.

The spelling of 43209872273 in words is "forty-three billion, two hundred nine million, eight hundred seventy-two thousand, two hundred seventy-three".