84045581 has 2 divisors, whose sum is σ = 84045582. Its totient is φ = 84045580.

The previous prime is 84045503. The next prime is 84045641. The reversal of 84045581 is 18554048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55636681 + 28408900 = 7459^2 + 5330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84045581 is a prime.

It is a super-2 number, since 2×84045581² = 14127319371255122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84045781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42022790 + 42022791.

It is an arithmetic number, because the mean of its divisors is an integer number (42022791).

Almost surely, 2^84045581 is an apocalyptic number.

It is an amenable number.

84045581 is a deficient number, since it is larger than the sum of its proper divisors (1).

84045581 is an equidigital number, since it uses as much as digits as its factorization.

84045581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 84045581 is about 9167.6377000839. The cubic root of 84045581 is about 438.0311150863.

The spelling of 84045581 in words is "eighty-four million, forty-five thousand, five hundred eighty-one".