984805981 has 2 divisors, whose sum is σ = 984805982. Its totient is φ = 984805980.

The previous prime is 984805957. The next prime is 984806029. The reversal of 984805981 is 189508489.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 928420900 + 56385081 = 30470^2 + 7509^2 .

It is a cyclic number.

It is not a de Polignac number, because 984805981 - 2¹¹ = 984803933 is a prime.

It is a super-2 number, since 2×984805981² = 1939685640426744722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (984805931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492402990 + 492402991.

It is an arithmetic number, because the mean of its divisors is an integer number (492402991).

Almost surely, 2^984805981 is an apocalyptic number.

It is an amenable number.

984805981 is a deficient number, since it is larger than the sum of its proper divisors (1).

984805981 is an equidigital number, since it uses as much as digits as its factorization.

984805981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 52.

The square root of 984805981 is about 31381.6185210387. The cubic root of 984805981 is about 994.9094573470.

The spelling of 984805981 in words is "nine hundred eighty-four million, eight hundred five thousand, nine hundred eighty-one".