84781111 has 2 divisors, whose sum is σ = 84781112. Its totient is φ = 84781110.

The previous prime is 84781093. The next prime is 84781121. The reversal of 84781111 is 11118748.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84781111 - 2¹⁵ = 84748343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84781121) 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, 42390555 + 42390556.

It is an arithmetic number, because the mean of its divisors is an integer number (42390556).

Almost surely, 2^84781111 is an apocalyptic number.

84781111 is a deficient number, since it is larger than the sum of its proper divisors (1).

84781111 is an equidigital number, since it uses as much as digits as its factorization.

84781111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 31.

The square root of 84781111 is about 9207.6658822961. The cubic root of 84781111 is about 439.3052240935.

Adding to 84781111 its reverse (11118748), we get a palindrome (95899859).

The spelling of 84781111 in words is "eighty-four million, seven hundred eighty-one thousand, one hundred eleven".