4138987549 has 2 divisors, whose sum is σ = 4138987550. Its totient is φ = 4138987548.

The previous prime is 4138987519. The next prime is 4138987553. The reversal of 4138987549 is 9457898314.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4092160900 + 46826649 = 63970^2 + 6843^2 .

It is a cyclic number.

It is not a de Polignac number, because 4138987549 - 2¹³ = 4138979357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4138987493 and 4138987502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4138987519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069493774 + 2069493775.

It is an arithmetic number, because the mean of its divisors is an integer number (2069493775).

Almost surely, 2^4138987549 is an apocalyptic number.

It is an amenable number.

4138987549 is a deficient number, since it is larger than the sum of its proper divisors (1).

4138987549 is an equidigital number, since it uses as much as digits as its factorization.

4138987549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 58.

The square root of 4138987549 is about 64334.9636589623. The cubic root of 4138987549 is about 1605.5778691228.

The spelling of 4138987549 in words is "four billion, one hundred thirty-eight million, nine hundred eighty-seven thousand, five hundred forty-nine".