84861779 has 2 divisors, whose sum is σ = 84861780. Its totient is φ = 84861778.

The previous prime is 84861769. The next prime is 84861811. The reversal of 84861779 is 97716848.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84861779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84861769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42430889 + 42430890.

It is an arithmetic number, because the mean of its divisors is an integer number (42430890).

Almost surely, 2^84861779 is an apocalyptic number.

84861779 is a deficient number, since it is larger than the sum of its proper divisors (1).

84861779 is an equidigital number, since it uses as much as digits as its factorization.

84861779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 84861779 is about 9212.0453212085. The cubic root of 84861779 is about 439.4445107805. Note that the first 3 decimals are identical.

The spelling of 84861779 in words is "eighty-four million, eight hundred sixty-one thousand, seven hundred seventy-nine".