43209872249 has 2 divisors, whose sum is σ = 43209872250. Its totient is φ = 43209872248.

The previous prime is 43209872239. The next prime is 43209872273. The reversal of 43209872249 is 94227890234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35280860224 + 7929012025 = 187832^2 + 89045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43209872249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43209872197 and 43209872206.

It is not a weakly prime, because it can be changed into another prime (43209872239) 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, 21604936124 + 21604936125.

It is an arithmetic number, because the mean of its divisors is an integer number (21604936125).

Almost surely, 2^43209872249 is an apocalyptic number.

It is an amenable number.

43209872249 is a deficient number, since it is larger than the sum of its proper divisors (1).

43209872249 is an equidigital number, since it uses as much as digits as its factorization.

43209872249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 43209872249 in words is "forty-three billion, two hundred nine million, eight hundred seventy-two thousand, two hundred forty-nine".