84194789771 has 2 divisors, whose sum is σ = 84194789772. Its totient is φ = 84194789770.

The previous prime is 84194789711. The next prime is 84194789803. The reversal of 84194789771 is 17798749148.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84194789771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84194789698 and 84194789707.

It is not a weakly prime, because it can be changed into another prime (84194789711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42097394885 + 42097394886.

It is an arithmetic number, because the mean of its divisors is an integer number (42097394886).

Almost surely, 2^84194789771 is an apocalyptic number.

84194789771 is a deficient number, since it is larger than the sum of its proper divisors (1).

84194789771 is an equidigital number, since it uses as much as digits as its factorization.

84194789771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28449792, while the sum is 65.

The spelling of 84194789771 in words is "eighty-four billion, one hundred ninety-four million, seven hundred eighty-nine thousand, seven hundred seventy-one".