81270331 has 2 divisors, whose sum is σ = 81270332. Its totient is φ = 81270330.

The previous prime is 81270311. The next prime is 81270337. The reversal of 81270331 is 13307218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81270331 - 2⁹ = 81269819 is a prime.

It is a super-2 number, since 2×81270331² = 13209733401699122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81270296 and 81270305.

It is not a weakly prime, because it can be changed into another prime (81270337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40635165 + 40635166.

It is an arithmetic number, because the mean of its divisors is an integer number (40635166).

Almost surely, 2^81270331 is an apocalyptic number.

81270331 is a deficient number, since it is larger than the sum of its proper divisors (1).

81270331 is an equidigital number, since it uses as much as digits as its factorization.

81270331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 81270331 is about 9015.0058790885. The cubic root of 81270331 is about 433.1556758263.

Adding to 81270331 its reverse (13307218), we get a palindrome (94577549).

The spelling of 81270331 in words is "eighty-one million, two hundred seventy thousand, three hundred thirty-one".