980945681 has 2 divisors, whose sum is σ = 980945682. Its totient is φ = 980945680.

The previous prime is 980945663. The next prime is 980945683. The reversal of 980945681 is 186549089.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648211600 + 332734081 = 25460^2 + 18241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-980945681 is a prime.

It is a super-2 number, since 2×980945681² = 1924508858145107522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 980945683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (980945683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490472840 + 490472841.

It is an arithmetic number, because the mean of its divisors is an integer number (490472841).

Almost surely, 2^980945681 is an apocalyptic number.

It is an amenable number.

980945681 is a deficient number, since it is larger than the sum of its proper divisors (1).

980945681 is an equidigital number, since it uses as much as digits as its factorization.

980945681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 980945681 is about 31320.0523786280. The cubic root of 980945681 is about 993.6077870092.

The spelling of 980945681 in words is "nine hundred eighty million, nine hundred forty-five thousand, six hundred eighty-one".