1338681697 has 2 divisors, whose sum is σ = 1338681698. Its totient is φ = 1338681696.

The previous prime is 1338681679. The next prime is 1338681761. The reversal of 1338681697 is 7961868331.

Together with previous prime (1338681679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 835845921 + 502835776 = 28911^2 + 22424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338681697 - 2⁷ = 1338681569 is a prime.

It is not a weakly prime, because it can be changed into another prime (1338681607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669340848 + 669340849.

It is an arithmetic number, because the mean of its divisors is an integer number (669340849).

Almost surely, 2^1338681697 is an apocalyptic number.

It is an amenable number.

1338681697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338681697 is an equidigital number, since it uses as much as digits as its factorization.

1338681697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 1338681697 is about 36587.9993577129. Note that the first 3 decimals coincide. The cubic root of 1338681697 is about 1102.1121119071.

The spelling of 1338681697 in words is "one billion, three hundred thirty-eight million, six hundred eighty-one thousand, six hundred ninety-seven".