81231041 has 4 divisors (see below), whose sum is σ = 81476784. Its totient is φ = 80985300.

The previous prime is 81231019. The next prime is 81231043. The reversal of 81231041 is 14013218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81231041 - 2²⁶ = 14122177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81231043) 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, 122375 + ... + 123036.

It is an arithmetic number, because the mean of its divisors is an integer number (20369196).

Almost surely, 2^81231041 is an apocalyptic number.

It is an amenable number.

81231041 is a deficient number, since it is larger than the sum of its proper divisors (245743).

81231041 is a wasteful number, since it uses less digits than its factorization.

81231041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245742.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 81231041 is about 9012.8264712020. The cubic root of 81231041 is about 433.0858617889.

Adding to 81231041 its reverse (14013218), we get a palindrome (95244259).

The spelling of 81231041 in words is "eighty-one million, two hundred thirty-one thousand, forty-one".