82167791 has 2 divisors, whose sum is σ = 82167792. Its totient is φ = 82167790.

The previous prime is 82167781. The next prime is 82167809. The reversal of 82167791 is 19776128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82167791 - 2⁶ = 82167727 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82167751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41083895 + 41083896.

It is an arithmetic number, because the mean of its divisors is an integer number (41083896).

Almost surely, 2^82167791 is an apocalyptic number.

82167791 is a deficient number, since it is larger than the sum of its proper divisors (1).

82167791 is an equidigital number, since it uses as much as digits as its factorization.

82167791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 82167791 is about 9064.6451116412. The cubic root of 82167791 is about 434.7442738806.

The spelling of 82167791 in words is "eighty-two million, one hundred sixty-seven thousand, seven hundred ninety-one".