1538668741 has 2 divisors, whose sum is σ = 1538668742. Its totient is φ = 1538668740.

The previous prime is 1538668739. The next prime is 1538668763. The reversal of 1538668741 is 1478668351.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 953512641 + 585156100 = 30879^2 + 24190^2 .

It is an emirp because it is prime and its reverse (1478668351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1538668741 - 2¹ = 1538668739 is a prime.

Together with 1538668739, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1538668721) 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, 769334370 + 769334371.

It is an arithmetic number, because the mean of its divisors is an integer number (769334371).

Almost surely, 2^1538668741 is an apocalyptic number.

It is an amenable number.

1538668741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538668741 is an equidigital number, since it uses as much as digits as its factorization.

1538668741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 49.

The square root of 1538668741 is about 39225.8682631755. The cubic root of 1538668741 is about 1154.4674971404.

The spelling of 1538668741 in words is "one billion, five hundred thirty-eight million, six hundred sixty-eight thousand, seven hundred forty-one".