1338344521 has 2 divisors, whose sum is σ = 1338344522. Its totient is φ = 1338344520.

The previous prime is 1338344507. The next prime is 1338344537. The reversal of 1338344521 is 1254438331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 902161296 + 436183225 = 30036^2 + 20885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338344521 - 2¹⁹ = 1337820233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1338345521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669172260 + 669172261.

It is an arithmetic number, because the mean of its divisors is an integer number (669172261).

Almost surely, 2^1338344521 is an apocalyptic number.

It is an amenable number.

1338344521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338344521 is an equidigital number, since it uses as much as digits as its factorization.

1338344521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 34.

The square root of 1338344521 is about 36583.3913272130. The cubic root of 1338344521 is about 1102.0195738632.

The spelling of 1338344521 in words is "one billion, three hundred thirty-eight million, three hundred forty-four thousand, five hundred twenty-one".