84041521 has 2 divisors, whose sum is σ = 84041522. Its totient is φ = 84041520.

The previous prime is 84041509. The next prime is 84041537. The reversal of 84041521 is 12514048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67881121 + 16160400 = 8239^2 + 4020^2 .

It is a cyclic number.

It is not a de Polignac number, because 84041521 - 2¹⁵ = 84008753 is a prime.

It is not a weakly prime, because it can be changed into another prime (84041561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42020760 + 42020761.

It is an arithmetic number, because the mean of its divisors is an integer number (42020761).

Almost surely, 2^84041521 is an apocalyptic number.

It is an amenable number.

84041521 is a deficient number, since it is larger than the sum of its proper divisors (1).

84041521 is an equidigital number, since it uses as much as digits as its factorization.

84041521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 84041521 is about 9167.4162663206. The cubic root of 84041521 is about 438.0240616321.

Adding to 84041521 its reverse (12514048), we get a palindrome (96555569).

The spelling of 84041521 in words is "eighty-four million, forty-one thousand, five hundred twenty-one".