1338121523 has 4 divisors (see below), whose sum is σ = 1339285248. Its totient is φ = 1336957800.

The previous prime is 1338121501. The next prime is 1338121583. The reversal of 1338121523 is 3251218331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3251218331 = 487 ⋅6676013.

It is a cyclic number.

It is not a de Polignac number, because 1338121523 - 2¹⁸ = 1337859379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1338121583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580136 + ... + 582437.

It is an arithmetic number, because the mean of its divisors is an integer number (334821312).

Almost surely, 2^1338121523 is an apocalyptic number.

1338121523 is a deficient number, since it is larger than the sum of its proper divisors (1163725).

1338121523 is a wasteful number, since it uses less digits than its factorization.

1338121523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163724.

The product of its digits is 4320, while the sum is 29.

The square root of 1338121523 is about 36580.3433964199. The cubic root of 1338121523 is about 1101.9583634630.

Adding to 1338121523 its reverse (3251218331), we get a palindrome (4589339854).

The spelling of 1338121523 in words is "one billion, three hundred thirty-eight million, one hundred twenty-one thousand, five hundred twenty-three".