84517889 has 2 divisors, whose sum is σ = 84517890. Its totient is φ = 84517888.

The previous prime is 84517883. The next prime is 84517907. The reversal of 84517889 is 98871548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84364225 + 153664 = 9185^2 + 392^2 .

It is a cyclic number.

It is not a de Polignac number, because 84517889 - 2¹⁶ = 84452353 is a prime.

It is a super-2 number, since 2×84517889² = 14286547122032642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84517883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42258944 + 42258945.

It is an arithmetic number, because the mean of its divisors is an integer number (42258945).

Almost surely, 2^84517889 is an apocalyptic number.

It is an amenable number.

84517889 is a deficient number, since it is larger than the sum of its proper divisors (1).

84517889 is an equidigital number, since it uses as much as digits as its factorization.

84517889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 50.

The square root of 84517889 is about 9193.3611372555. The cubic root of 84517889 is about 438.8501121919.

The spelling of 84517889 in words is "eighty-four million, five hundred seventeen thousand, eight hundred eighty-nine".