986981 has 2 divisors, whose sum is σ = 986982. Its totient is φ = 986980.

The previous prime is 986963. The next prime is 986983. The reversal of 986981 is 189689.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 982081 + 4900 = 991^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 986981 - 2¹⁸ = 724837 is a prime.

It is a super-2 number, since 2×986981² = 1948262988722, which contains 22 as substring.

Together with 986983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 986981.

It is not a weakly prime, because it can be changed into another prime (986983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493490 + 493491.

It is an arithmetic number, because the mean of its divisors is an integer number (493491).

2⁹⁸⁶⁹⁸¹ is an apocalyptic number.

It is an amenable number.

986981 is a deficient number, since it is larger than the sum of its proper divisors (1).

986981 is an equidigital number, since it uses as much as digits as its factorization.

986981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 41.

The square root of 986981 is about 993.4691741569. The cubic root of 986981 is about 99.5641363220.

The spelling of 986981 in words is "nine hundred eighty-six thousand, nine hundred eighty-one".