81771327 has 24 divisors (see below), whose sum is σ = 129813840. Its totient is φ = 49188480.

The previous prime is 81771323. The next prime is 81771341. The reversal of 81771327 is 72317718.

It is a happy number.

It is not a de Polignac number, because 81771327 - 2² = 81771323 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 81771291 and 81771300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81771323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10549 + ... + 16577.

It is an arithmetic number, because the mean of its divisors is an integer number (5408910).

Almost surely, 2^81771327 is an apocalyptic number.

81771327 is a deficient number, since it is larger than the sum of its proper divisors (48042513).

81771327 is a wasteful number, since it uses less digits than its factorization.

81771327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6183 (or 6180 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 81771327 is about 9042.7499688977. The cubic root of 81771327 is about 434.0439247805.

The spelling of 81771327 in words is "eighty-one million, seven hundred seventy-one thousand, three hundred twenty-seven".