1338908513 has 2 divisors, whose sum is σ = 1338908514. Its totient is φ = 1338908512.

The previous prime is 1338908497. The next prime is 1338908521. The reversal of 1338908513 is 3158098331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 808435489 + 530473024 = 28433^2 + 23032^2 .

It is an emirp because it is prime and its reverse (3158098331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1338908513 - 2⁴ = 1338908497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1338908533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669454256 + 669454257.

It is an arithmetic number, because the mean of its divisors is an integer number (669454257).

Almost surely, 2^1338908513 is an apocalyptic number.

It is an amenable number.

1338908513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338908513 is an equidigital number, since it uses as much as digits as its factorization.

1338908513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 1338908513 is about 36591.0988219813. The cubic root of 1338908513 is about 1102.1743528776.

The spelling of 1338908513 in words is "one billion, three hundred thirty-eight million, nine hundred eight thousand, five hundred thirteen".