138231313 has 16 divisors (see below), whose sum is σ = 156476160. Its totient is φ = 120960000.
The previous prime is 138231239. The next prime is 138231319. The reversal of 138231313 is 313132831.
It is a cyclic number.
It is not a de Polignac number, because 138231313 - 29 = 138230801 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (138231319) 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 15 ways as a sum of consecutive naturals, for example, 183688 + ... + 184438.
It is an arithmetic number, because the mean of its divisors is an integer number (9779760).
Almost surely, 2138231313 is an apocalyptic number.
It is an amenable number.
138231313 is a deficient number, since it is larger than the sum of its proper divisors (18244847).
138231313 is a wasteful number, since it uses less digits than its factorization.
138231313 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1368.
The product of its digits is 1296, while the sum is 25.
The square root of 138231313 is about 11757.1813373784. The cubic root of 138231313 is about 517.0534946087.
The spelling of 138231313 in words is "one hundred thirty-eight million, two hundred thirty-one thousand, three hundred thirteen".
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