84000491 has 2 divisors, whose sum is σ = 84000492. Its totient is φ = 84000490.

The previous prime is 84000481. The next prime is 84000509. The reversal of 84000491 is 19400048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84000491 - 2¹⁰ = 83999467 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84000491.

It is not a weakly prime, because it can be changed into another prime (84000401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42000245 + 42000246.

It is an arithmetic number, because the mean of its divisors is an integer number (42000246).

Almost surely, 2^84000491 is an apocalyptic number.

84000491 is a deficient number, since it is larger than the sum of its proper divisors (1).

84000491 is an equidigital number, since it uses as much as digits as its factorization.

84000491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 84000491 is about 9165.1781761186. The cubic root of 84000491 is about 437.9527672982.

The spelling of 84000491 in words is "eighty-four million, four hundred ninety-one", and thus it is an aban number.