81327147 has 32 divisors (see below), whose sum is σ = 124396800. Its totient is φ = 46811520.

The previous prime is 81327143. The next prime is 81327151. The reversal of 81327147 is 74172318.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81327143) and next prime (81327151).

It is not a de Polignac number, because 81327147 - 2² = 81327143 is a prime.

It is a super-2 number, since 2×81327147² = 13228209678319218, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (81327143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51729 + ... + 53277.

It is an arithmetic number, because the mean of its divisors is an integer number (3887400).

Almost surely, 2^81327147 is an apocalyptic number.

81327147 is a deficient number, since it is larger than the sum of its proper divisors (43069653).

81327147 is a wasteful number, since it uses less digits than its factorization.

81327147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643.

The product of its digits is 9408, while the sum is 33.

The square root of 81327147 is about 9018.1565189345. The cubic root of 81327147 is about 433.2565918672.

It can be divided in two parts, 813271 and 47, that added together give a palindrome (813318).

The spelling of 81327147 in words is "eighty-one million, three hundred twenty-seven thousand, one hundred forty-seven".