138283121 has 4 divisors (see below), whose sum is σ = 145561200. Its totient is φ = 131005044.

The previous prime is 138283111. The next prime is 138283147. The reversal of 138283121 is 121382831.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138283121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138283111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3639011 + ... + 3639048.

It is an arithmetic number, because the mean of its divisors is an integer number (36390300).

Almost surely, 2^138283121 is an apocalyptic number.

It is an amenable number.

138283121 is a deficient number, since it is larger than the sum of its proper divisors (7278079).

138283121 is an equidigital number, since it uses as much as digits as its factorization.

138283121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7278078.

The product of its digits is 2304, while the sum is 29.

The square root of 138283121 is about 11759.3843801451. The cubic root of 138283121 is about 517.1180823903.

The spelling of 138283121 in words is "one hundred thirty-eight million, two hundred eighty-three thousand, one hundred twenty-one".