138241609 has 4 divisors (see below), whose sum is σ = 150809040. Its totient is φ = 125674180.

The previous prime is 138241589. The next prime is 138241613. The reversal of 138241609 is 906142831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 906142831 = 11 ⋅82376621.

It is a cyclic number.

It is not a de Polignac number, because 138241609 - 2²⁷ = 4023881 is a prime.

It is a super-2 number, since 2×138241609² = 38221484917817762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138241639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6283699 + ... + 6283720.

It is an arithmetic number, because the mean of its divisors is an integer number (37702260).

Almost surely, 2^138241609 is an apocalyptic number.

It is an amenable number.

138241609 is a deficient number, since it is larger than the sum of its proper divisors (12567431).

138241609 is a wasteful number, since it uses less digits than its factorization.

138241609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12567430.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 138241609 is about 11757.6191892747. The cubic root of 138241609 is about 517.0663316678.

The spelling of 138241609 in words is "one hundred thirty-eight million, two hundred forty-one thousand, six hundred nine".