84278011 has 2 divisors, whose sum is σ = 84278012. Its totient is φ = 84278010.

The previous prime is 84277997. The next prime is 84278021. The reversal of 84278011 is 11087248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84278011 - 2¹⁵ = 84245243 is a prime.

It is a super-2 number, since 2×84278011² = 14205566276232242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84278021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42139005 + 42139006.

It is an arithmetic number, because the mean of its divisors is an integer number (42139006).

Almost surely, 2^84278011 is an apocalyptic number.

84278011 is a deficient number, since it is larger than the sum of its proper divisors (1).

84278011 is an equidigital number, since it uses as much as digits as its factorization.

84278011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 84278011 is about 9180.3056049349. The cubic root of 84278011 is about 438.4345384855.

The spelling of 84278011 in words is "eighty-four million, two hundred seventy-eight thousand, eleven".