181131938 has 8 divisors (see below), whose sum is σ = 292597788. Its totient is φ = 83599344.

The previous prime is 181131919. The next prime is 181131967. The reversal of 181131938 is 839131181.

It can be written as a sum of positive squares in 2 ways, for example, as 176278729 + 4853209 = 13277^2 + 2203^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 181131898 and 181131907.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3483281 + ... + 3483332.

Almost surely, 2^181131938 is an apocalyptic number.

181131938 is a deficient number, since it is larger than the sum of its proper divisors (111465850).

181131938 is a wasteful number, since it uses less digits than its factorization.

181131938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6966628.

The product of its digits is 5184, while the sum is 35.

The square root of 181131938 is about 13458.5265909757. The cubic root of 181131938 is about 565.8026944039.

The spelling of 181131938 in words is "one hundred eighty-one million, one hundred thirty-one thousand, nine hundred thirty-eight".