1338831217 has 2 divisors, whose sum is σ = 1338831218. Its totient is φ = 1338831216.

The previous prime is 1338831211. The next prime is 1338831223. The reversal of 1338831217 is 7121388331.

It is a balanced prime because it is at equal distance from previous prime (1338831211) and next prime (1338831223).

It can be written as a sum of positive squares in only one way, i.e., 1049695201 + 289136016 = 32399^2 + 17004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1338831217 is a prime.

It is a super-2 number, since 2×1338831217² = 3584938055227402178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1338831211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669415608 + 669415609.

It is an arithmetic number, because the mean of its divisors is an integer number (669415609).

Almost surely, 2^1338831217 is an apocalyptic number.

It is an amenable number.

1338831217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338831217 is an equidigital number, since it uses as much as digits as its factorization.

1338831217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 1338831217 is about 36590.0425935800. The cubic root of 1338831217 is about 1102.1531427383.

The spelling of 1338831217 in words is "one billion, three hundred thirty-eight million, eight hundred thirty-one thousand, two hundred seventeen".