81327097 has 2 divisors, whose sum is σ = 81327098. Its totient is φ = 81327096.

The previous prime is 81327053. The next prime is 81327143. The reversal of 81327097 is 79072318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66765241 + 14561856 = 8171^2 + 3816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81327097 is a prime.

It is a super-2 number, since 2×81327097² = 13228193412894818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81327017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40663548 + 40663549.

It is an arithmetic number, because the mean of its divisors is an integer number (40663549).

Almost surely, 2^81327097 is an apocalyptic number.

It is an amenable number.

81327097 is a deficient number, since it is larger than the sum of its proper divisors (1).

81327097 is an equidigital number, since it uses as much as digits as its factorization.

81327097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 81327097 is about 9018.1537467488. The cubic root of 81327097 is about 433.2565030783.

The spelling of 81327097 in words is "eighty-one million, three hundred twenty-seven thousand, ninety-seven".