1338426521 has 2 divisors, whose sum is σ = 1338426522. Its totient is φ = 1338426520.

The previous prime is 1338426491. The next prime is 1338426527. The reversal of 1338426521 is 1256248331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1336633600 + 1792921 = 36560^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338426521 - 2²² = 1334232217 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 (1338426527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669213260 + 669213261.

It is an arithmetic number, because the mean of its divisors is an integer number (669213261).

Almost surely, 2^1338426521 is an apocalyptic number.

It is an amenable number.

1338426521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338426521 is an equidigital number, since it uses as much as digits as its factorization.

1338426521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 1338426521 is about 36584.5120371996. The cubic root of 1338426521 is about 1102.0420802154.

The spelling of 1338426521 in words is "one billion, three hundred thirty-eight million, four hundred twenty-six thousand, five hundred twenty-one".