81327151 has 2 divisors, whose sum is σ = 81327152. Its totient is φ = 81327150.

The previous prime is 81327143. The next prime is 81327157. The reversal of 81327151 is 15172318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81327151 - 2³ = 81327143 is a prime.

It is a super-2 number, since 2×81327151² = 13228210979553602, which contains 22 as substring.

It is a Chen prime.

It is equal to p_4742461 and since 81327151 and 4742461 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81327157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40663575 + 40663576.

It is an arithmetic number, because the mean of its divisors is an integer number (40663576).

Almost surely, 2^81327151 is an apocalyptic number.

81327151 is a deficient number, since it is larger than the sum of its proper divisors (1).

81327151 is an equidigital number, since it uses as much as digits as its factorization.

81327151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 81327151 is about 9018.1567407093. The cubic root of 81327151 is about 433.2565989703.

Adding to 81327151 its reverse (15172318), we get a palindrome (96499469).

The spelling of 81327151 in words is "eighty-one million, three hundred twenty-seven thousand, one hundred fifty-one".