82139747 has 2 divisors, whose sum is σ = 82139748. Its totient is φ = 82139746.

The previous prime is 82139713. The next prime is 82139821. The reversal of 82139747 is 74793128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82139747 - 2⁶ = 82139683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82130747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41069873 + 41069874.

It is an arithmetic number, because the mean of its divisors is an integer number (41069874).

Almost surely, 2^82139747 is an apocalyptic number.

82139747 is a deficient number, since it is larger than the sum of its proper divisors (1).

82139747 is an equidigital number, since it uses as much as digits as its factorization.

82139747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 82139747 is about 9063.0980906090. The cubic root of 82139747 is about 434.6948086113.

The spelling of 82139747 in words is "eighty-two million, one hundred thirty-nine thousand, seven hundred forty-seven".