84159917 has 2 divisors, whose sum is σ = 84159918. Its totient is φ = 84159916.

The previous prime is 84159871. The next prime is 84159923. The reversal of 84159917 is 71995148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82828201 + 1331716 = 9101^2 + 1154^2 .

It is a cyclic number.

It is not a de Polignac number, because 84159917 - 2⁶ = 84159853 is a prime.

It is a Chen prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42079958 + 42079959.

It is an arithmetic number, because the mean of its divisors is an integer number (42079959).

Almost surely, 2^84159917 is an apocalyptic number.

It is an amenable number.

84159917 is a deficient number, since it is larger than the sum of its proper divisors (1).

84159917 is an equidigital number, since it uses as much as digits as its factorization.

84159917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 84159917 is about 9173.8714292277. The cubic root of 84159917 is about 438.2296582704.

The spelling of 84159917 in words is "eighty-four million, one hundred fifty-nine thousand, nine hundred seventeen".