81241238 has 16 divisors (see below), whose sum is σ = 135762480. Its totient is φ = 36202656.

The previous prime is 81241231. The next prime is 81241241. The reversal of 81241238 is 83214218.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 81241238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81241231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53120 + ... + 54627.

It is an arithmetic number, because the mean of its divisors is an integer number (8485155).

Almost surely, 2^81241238 is an apocalyptic number.

81241238 is a deficient number, since it is larger than the sum of its proper divisors (54521242).

81241238 is a wasteful number, since it uses less digits than its factorization.

81241238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107791.

The product of its digits is 3072, while the sum is 29.

The square root of 81241238 is about 9013.3921472440. The cubic root of 81241238 is about 433.1039829066.

The spelling of 81241238 in words is "eighty-one million, two hundred forty-one thousand, two hundred thirty-eight".