84927581 has 2 divisors, whose sum is σ = 84927582. Its totient is φ = 84927580.

The previous prime is 84927539. The next prime is 84927611. The reversal of 84927581 is 18572948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84015556 + 912025 = 9166^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 84927581 - 2²² = 80733277 is a prime.

It is a super-2 number, since 2×84927581² = 14425388029023122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84927281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42463790 + 42463791.

It is an arithmetic number, because the mean of its divisors is an integer number (42463791).

Almost surely, 2^84927581 is an apocalyptic number.

It is an amenable number.

84927581 is a deficient number, since it is larger than the sum of its proper divisors (1).

84927581 is an equidigital number, since it uses as much as digits as its factorization.

84927581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The square root of 84927581 is about 9215.6161486902. The cubic root of 84927581 is about 439.5580634985.

The spelling of 84927581 in words is "eighty-four million, nine hundred twenty-seven thousand, five hundred eighty-one".