986581 has 2 divisors, whose sum is σ = 986582. Its totient is φ = 986580.

The previous prime is 986569. The next prime is 986593. The reversal of 986581 is 185689.

It is the 406-th star number.

It is a balanced prime because it is at equal distance from previous prime (986569) and next prime (986593).

It can be written as a sum of positive squares in only one way, i.e., 792100 + 194481 = 890^2 + 441^2 .

It is a cyclic number.

It is not a de Polignac number, because 986581 - 2¹³ = 978389 is a prime.

It is a super-2 number, since 2×986581² = 1946684139122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 986581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (986281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493290 + 493291.

It is an arithmetic number, because the mean of its divisors is an integer number (493291).

2⁹⁸⁶⁵⁸¹ is an apocalyptic number.

It is an amenable number.

986581 is a deficient number, since it is larger than the sum of its proper divisors (1).

986581 is an equidigital number, since it uses as much as digits as its factorization.

986581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 986581 is about 993.2678390042. The cubic root of 986581 is about 99.5506841766.

The spelling of 986581 in words is "nine hundred eighty-six thousand, five hundred eighty-one".