1338553121 has 2 divisors, whose sum is σ = 1338553122. Its totient is φ = 1338553120.

The previous prime is 1338553093. The next prime is 1338553129. The reversal of 1338553121 is 1213558331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1175735521 + 162817600 = 34289^2 + 12760^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338553121 - 2¹⁸ = 1338290977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1338553129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669276560 + 669276561.

It is an arithmetic number, because the mean of its divisors is an integer number (669276561).

Almost surely, 2^1338553121 is an apocalyptic number.

It is an amenable number.

1338553121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338553121 is an equidigital number, since it uses as much as digits as its factorization.

1338553121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 32.

The square root of 1338553121 is about 36586.2422366660. The cubic root of 1338553121 is about 1102.0768260224.

The spelling of 1338553121 in words is "one billion, three hundred thirty-eight million, five hundred fifty-three thousand, one hundred twenty-one".