84158681 has 2 divisors, whose sum is σ = 84158682. Its totient is φ = 84158680.

The previous prime is 84158593. The next prime is 84158699. The reversal of 84158681 is 18685148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77088400 + 7070281 = 8780^2 + 2659^2 .

It is a cyclic number.

It is not a de Polignac number, because 84158681 - 2¹⁰ = 84157657 is a prime.

It is a super-3 number, since 3×84158681³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is equal to p_4897742 and since 84158681 and 4897742 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (84158881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42079340 + 42079341.

It is an arithmetic number, because the mean of its divisors is an integer number (42079341).

Almost surely, 2^84158681 is an apocalyptic number.

It is an amenable number.

84158681 is a deficient number, since it is larger than the sum of its proper divisors (1).

84158681 is an equidigital number, since it uses as much as digits as its factorization.

84158681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61440, while the sum is 41.

The square root of 84158681 is about 9173.8040637459. The cubic root of 84158681 is about 438.2275129320.

The spelling of 84158681 in words is "eighty-four million, one hundred fifty-eight thousand, six hundred eighty-one".