138431353 has 4 divisors (see below), whose sum is σ = 138455460. Its totient is φ = 138407248.

The previous prime is 138431347. The next prime is 138431369. The reversal of 138431353 is 353134831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84143929 + 54287424 = 9173^2 + 7368^2 .

It is a cyclic number.

It is not a de Polignac number, because 138431353 - 2¹³ = 138423161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138431333) 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, 2103 + ... + 16771.

It is an arithmetic number, because the mean of its divisors is an integer number (34613865).

Almost surely, 2^138431353 is an apocalyptic number.

It is an amenable number.

138431353 is a deficient number, since it is larger than the sum of its proper divisors (24107).

138431353 is an equidigital number, since it uses as much as digits as its factorization.

138431353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24106.

The product of its digits is 12960, while the sum is 31.

The square root of 138431353 is about 11765.6854028994. The cubic root of 138431353 is about 517.3027905790.

The spelling of 138431353 in words is "one hundred thirty-eight million, four hundred thirty-one thousand, three hundred fifty-three".