978107681 has 2 divisors, whose sum is σ = 978107682. Its totient is φ = 978107680.

The previous prime is 978107677. The next prime is 978107687. The reversal of 978107681 is 186701879.

978107681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 937339456 + 40768225 = 30616^2 + 6385^2 .

It is a cyclic number.

It is not a de Polignac number, because 978107681 - 2² = 978107677 is a prime.

It is a super-2 number, since 2×978107681² = 1913389271262395522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (978107687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489053840 + 489053841.

It is an arithmetic number, because the mean of its divisors is an integer number (489053841).

Almost surely, 2^978107681 is an apocalyptic number.

It is an amenable number.

978107681 is a deficient number, since it is larger than the sum of its proper divisors (1).

978107681 is an equidigital number, since it uses as much as digits as its factorization.

978107681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 47.

The square root of 978107681 is about 31274.7131241839. The cubic root of 978107681 is about 992.6486504207.

The spelling of 978107681 in words is "nine hundred seventy-eight million, one hundred seven thousand, six hundred eighty-one".