84978611 has 2 divisors, whose sum is σ = 84978612. Its totient is φ = 84978610.

The previous prime is 84978581. The next prime is 84978653. The reversal of 84978611 is 11687948.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84978611 is a prime.

It is not a weakly prime, because it can be changed into another prime (84978211) 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, 42489305 + 42489306.

It is an arithmetic number, because the mean of its divisors is an integer number (42489306).

Almost surely, 2^84978611 is an apocalyptic number.

84978611 is a deficient number, since it is larger than the sum of its proper divisors (1).

84978611 is an equidigital number, since it uses as much as digits as its factorization.

84978611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 44.

The square root of 84978611 is about 9218.3844029201. The cubic root of 84978611 is about 439.6460842044.

The spelling of 84978611 in words is "eighty-four million, nine hundred seventy-eight thousand, six hundred eleven".