81327833 has 2 divisors, whose sum is σ = 81327834. Its totient is φ = 81327832.

The previous prime is 81327821. The next prime is 81327871. The reversal of 81327833 is 33872318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80066704 + 1261129 = 8948^2 + 1123^2 .

It is a cyclic number.

It is not a de Polignac number, because 81327833 - 2¹⁴ = 81311449 is a prime.

It is a super-2 number, since 2×81327833² = 13228432840951778, which contains 22 as substring.

It is equal to p_4742495 and since 81327833 and 4742495 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 81327793 and 81327802.

It is not a weakly prime, because it can be changed into another prime (81027833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40663916 + 40663917.

It is an arithmetic number, because the mean of its divisors is an integer number (40663917).

Almost surely, 2^81327833 is an apocalyptic number.

It is an amenable number.

81327833 is a deficient number, since it is larger than the sum of its proper divisors (1).

81327833 is an equidigital number, since it uses as much as digits as its factorization.

81327833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 81327833 is about 9018.1945532351. The cubic root of 81327833 is about 433.2578100466.

The spelling of 81327833 in words is "eighty-one million, three hundred twenty-seven thousand, eight hundred thirty-three".