84819491 has 2 divisors, whose sum is σ = 84819492. Its totient is φ = 84819490.

The previous prime is 84819473. The next prime is 84819517. The reversal of 84819491 is 19491848.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84819491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84819421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42409745 + 42409746.

It is an arithmetic number, because the mean of its divisors is an integer number (42409746).

Almost surely, 2^84819491 is an apocalyptic number.

84819491 is a deficient number, since it is larger than the sum of its proper divisors (1).

84819491 is an equidigital number, since it uses as much as digits as its factorization.

84819491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 44.

The square root of 84819491 is about 9209.7497794457. The cubic root of 84819491 is about 439.3715045448.

The spelling of 84819491 in words is "eighty-four million, eight hundred nineteen thousand, four hundred ninety-one".