6438872249 has 2 divisors, whose sum is σ = 6438872250. Its totient is φ = 6438872248.

The previous prime is 6438872221. The next prime is 6438872351. The reversal of 6438872249 is 9422788346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4905601600 + 1533270649 = 70040^2 + 39157^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6438872249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6438872249.

It is not a weakly prime, because it can be changed into another prime (6438862249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219436124 + 3219436125.

It is an arithmetic number, because the mean of its divisors is an integer number (3219436125).

Almost surely, 2^6438872249 is an apocalyptic number.

It is an amenable number.

6438872249 is a deficient number, since it is larger than the sum of its proper divisors (1).

6438872249 is an equidigital number, since it uses as much as digits as its factorization.

6438872249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 53.

The square root of 6438872249 is about 80242.5837632363. The cubic root of 6438872249 is about 1860.3868861258.

The spelling of 6438872249 in words is "six billion, four hundred thirty-eight million, eight hundred seventy-two thousand, two hundred forty-nine".