138352009849 has 3 divisors (see below), whose sum is σ = 138352381807. Its totient is φ = 138351637892.

The previous prime is 138352009841. The next prime is 138352009879. The reversal of 138352009849 is 948900253831.

The square root of 138352009849 is 371957.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 99121077225 + 39230932624 = 314835^2 + 198068^2 .

It is not a de Polignac number, because 138352009849 - 2³ = 138352009841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138352009796 and 138352009805.

It is not an unprimeable number, because it can be changed into a prime (138352009841) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 185979 + ... + 557935.

Almost surely, 2^138352009849 is an apocalyptic number.

138352009849 is the 371957-th square number.

138352009849 is the 185979-th centered octagonal number.

It is an amenable number.

138352009849 is a deficient number, since it is larger than the sum of its proper divisors (371958).

138352009849 is an frugal number, since it uses more digits than its factorization.

138352009849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743914 (or 371957 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 138352009849 in words is "one hundred thirty-eight billion, three hundred fifty-two million, nine thousand, eight hundred forty-nine".