7875438149 has 2 divisors, whose sum is σ = 7875438150. Its totient is φ = 7875438148.

The previous prime is 7875438133. The next prime is 7875438161. The reversal of 7875438149 is 9418345787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5949808225 + 1925629924 = 77135^2 + 43882^2 .

It is an emirp because it is prime and its reverse (9418345787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7875438149 - 2⁴ = 7875438133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7875438094 and 7875438103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7875437149) 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, 3937719074 + 3937719075.

It is an arithmetic number, because the mean of its divisors is an integer number (3937719075).

Almost surely, 2^7875438149 is an apocalyptic number.

It is an amenable number.

7875438149 is a deficient number, since it is larger than the sum of its proper divisors (1).

7875438149 is an equidigital number, since it uses as much as digits as its factorization.

7875438149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6773760, while the sum is 56.

The square root of 7875438149 is about 88743.6654021007. The cubic root of 7875438149 is about 1989.5655010403.

The spelling of 7875438149 in words is "seven billion, eight hundred seventy-five million, four hundred thirty-eight thousand, one hundred forty-nine".