81041138 has 8 divisors (see below), whose sum is σ = 125753580. Its totient is φ = 39123280.

The previous prime is 81041131. The next prime is 81041143. The reversal of 81041138 is 83114018.

It can be written as a sum of positive squares in 2 ways, for example, as 70845889 + 10195249 = 8417^2 + 3193^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81041131) 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, 698573 + ... + 698688.

Almost surely, 2^81041138 is an apocalyptic number.

81041138 is a deficient number, since it is larger than the sum of its proper divisors (44712442).

81041138 is a wasteful number, since it uses less digits than its factorization.

81041138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397292.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 81041138 is about 9002.2851543372. The cubic root of 81041138 is about 432.7481071679.

The spelling of 81041138 in words is "eighty-one million, forty-one thousand, one hundred thirty-eight".