82771145 has 4 divisors (see below), whose sum is σ = 99325380. Its totient is φ = 66216912.

The previous prime is 82771141. The next prime is 82771177. The reversal of 82771145 is 54117728.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9223369 + 73547776 = 3037^2 + 8576^2 .

It is a cyclic number.

It is not a de Polignac number, because 82771145 - 2² = 82771141 is a prime.

It is a super-2 number, since 2×82771145² = 13702124889222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82771141) 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 in 3 ways as a sum of consecutive naturals, for example, 8277110 + ... + 8277119.

It is an arithmetic number, because the mean of its divisors is an integer number (24831345).

Almost surely, 2^82771145 is an apocalyptic number.

It is an amenable number.

82771145 is a deficient number, since it is larger than the sum of its proper divisors (16554235).

82771145 is a wasteful number, since it uses less digits than its factorization.

82771145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16554234.

The product of its digits is 15680, while the sum is 35.

The square root of 82771145 is about 9097.8648594052. The cubic root of 82771145 is about 435.8057817605.

The spelling of 82771145 in words is "eighty-two million, seven hundred seventy-one thousand, one hundred forty-five".