83138381 has 4 divisors (see below), whose sum is σ = 88028892. Its totient is φ = 78247872.

The previous prime is 83138351. The next prime is 83138387. The reversal of 83138381 is 18383138.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18383138 = 2 ⋅9191569.

It can be written as a sum of positive squares in 2 ways, for example, as 54612100 + 28526281 = 7390^2 + 5341^2 .

It is not a de Polignac number, because 83138381 - 2¹⁰ = 83137357 is a prime.

It is a super-2 number, since 2×83138381² = 13823980790602322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83138387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2445230 + ... + 2445263.

It is an arithmetic number, because the mean of its divisors is an integer number (22007223).

Almost surely, 2^83138381 is an apocalyptic number.

It is an amenable number.

83138381 is a deficient number, since it is larger than the sum of its proper divisors (4890511).

83138381 is a wasteful number, since it uses less digits than its factorization.

83138381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4890510.

The product of its digits is 13824, while the sum is 35.

The square root of 83138381 is about 9118.0250602858. The cubic root of 83138381 is about 436.4493533092.

The spelling of 83138381 in words is "eighty-three million, one hundred thirty-eight thousand, three hundred eighty-one".