81041131 has 2 divisors, whose sum is σ = 81041132. Its totient is φ = 81041130.

The previous prime is 81041101. The next prime is 81041143. The reversal of 81041131 is 13114018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81041131 - 2⁷ = 81041003 is a prime.

It is a super-2 number, since 2×81041131² = 13135329827518322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81041099 and 81041108.

It is not a weakly prime, because it can be changed into another prime (81041101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40520565 + 40520566.

It is an arithmetic number, because the mean of its divisors is an integer number (40520566).

Almost surely, 2^81041131 is an apocalyptic number.

81041131 is a deficient number, since it is larger than the sum of its proper divisors (1).

81041131 is an equidigital number, since it uses as much as digits as its factorization.

81041131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 81041131 is about 9002.2847655470. The cubic root of 81041131 is about 432.7480947083.

Adding to 81041131 its reverse (13114018), we get a palindrome (94155149).

The spelling of 81041131 in words is "eighty-one million, forty-one thousand, one hundred thirty-one".