5278121449 has 2 divisors, whose sum is σ = 5278121450. Its totient is φ = 5278121448.

The previous prime is 5278121389. The next prime is 5278121467. The reversal of 5278121449 is 9441218725.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3191459049 + 2086662400 = 56493^2 + 45680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5278121449 is a prime.

It is not a weakly prime, because it can be changed into another prime (5278721449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639060724 + 2639060725.

It is an arithmetic number, because the mean of its divisors is an integer number (2639060725).

Almost surely, 2^5278121449 is an apocalyptic number.

It is an amenable number.

5278121449 is a deficient number, since it is larger than the sum of its proper divisors (1).

5278121449 is an equidigital number, since it uses as much as digits as its factorization.

5278121449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 5278121449 is about 72650.6809947436. The cubic root of 5278121449 is about 1741.1110015035. Note that the first 3 decimals are identical.

The spelling of 5278121449 in words is "five billion, two hundred seventy-eight million, one hundred twenty-one thousand, four hundred forty-nine".