84103909 has 2 divisors, whose sum is σ = 84103910. Its totient is φ = 84103908.

The previous prime is 84103907. The next prime is 84103949. The reversal of 84103909 is 90930148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83210884 + 893025 = 9122^2 + 945^2 .

It is a cyclic number.

It is not a de Polignac number, because 84103909 - 2¹ = 84103907 is a prime.

Together with 84103907, it forms a pair of twin primes.

It is equal to p_4894720 and since 84103909 and 4894720 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84103907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42051954 + 42051955.

It is an arithmetic number, because the mean of its divisors is an integer number (42051955).

Almost surely, 2^84103909 is an apocalyptic number.

It is an amenable number.

84103909 is a deficient number, since it is larger than the sum of its proper divisors (1).

84103909 is an equidigital number, since it uses as much as digits as its factorization.

84103909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 84103909 is about 9170.8183386217. The cubic root of 84103909 is about 438.1324234889.

The spelling of 84103909 in words is "eighty-four million, one hundred three thousand, nine hundred nine".