84041509 has 2 divisors, whose sum is σ = 84041510. Its totient is φ = 84041508.

The previous prime is 84041453. The next prime is 84041521. The reversal of 84041509 is 90514048.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74909025 + 9132484 = 8655^2 + 3022^2 .

It is a cyclic number.

It is not a de Polignac number, because 84041509 - 2⁷ = 84041381 is a prime.

It is equal to p_4891405 and since 84041509 and 4891405 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 (84041539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42020754 + 42020755.

It is an arithmetic number, because the mean of its divisors is an integer number (42020755).

Almost surely, 2^84041509 is an apocalyptic number.

It is an amenable number.

84041509 is a deficient number, since it is larger than the sum of its proper divisors (1).

84041509 is an equidigital number, since it uses as much as digits as its factorization.

84041509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 84041509 is about 9167.4156118287. The cubic root of 84041509 is about 438.0240407841.

The spelling of 84041509 in words is "eighty-four million, forty-one thousand, five hundred nine".