82145771 has 2 divisors, whose sum is σ = 82145772. Its totient is φ = 82145770.

The previous prime is 82145761. The next prime is 82145827. The reversal of 82145771 is 17754128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82145771 - 2¹⁴ = 82129387 is a prime.

It is not a weakly prime, because it can be changed into another prime (82145731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41072885 + 41072886.

It is an arithmetic number, because the mean of its divisors is an integer number (41072886).

Almost surely, 2^82145771 is an apocalyptic number.

82145771 is a deficient number, since it is larger than the sum of its proper divisors (1).

82145771 is an equidigital number, since it uses as much as digits as its factorization.

82145771 is an evil number, because the sum of its binary digits is even.

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

The square root of 82145771 is about 9063.4304212037. The cubic root of 82145771 is about 434.7054349629.

Adding to 82145771 its reverse (17754128), we get a palindrome (99899899).

The spelling of 82145771 in words is "eighty-two million, one hundred forty-five thousand, seven hundred seventy-one".