84664109 has 2 divisors, whose sum is σ = 84664110. Its totient is φ = 84664108.

The previous prime is 84664091. The next prime is 84664117. The reversal of 84664109 is 90146648.

Together with previous prime (84664091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83814025 + 850084 = 9155^2 + 922^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84664109 is a prime.

It is a super-2 number, since 2×84664109² = 14336022705527762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84664189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42332054 + 42332055.

It is an arithmetic number, because the mean of its divisors is an integer number (42332055).

Almost surely, 2^84664109 is an apocalyptic number.

It is an amenable number.

84664109 is a deficient number, since it is larger than the sum of its proper divisors (1).

84664109 is an equidigital number, since it uses as much as digits as its factorization.

84664109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 84664109 is about 9201.3101784474. The cubic root of 84664109 is about 439.1030436313.

The spelling of 84664109 in words is "eighty-four million, six hundred sixty-four thousand, one hundred nine".