968647681 has 4 divisors (see below), whose sum is σ = 968786500. Its totient is φ = 968508864.

The previous prime is 968647657. The next prime is 968647699. The reversal of 968647681 is 186746869.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 905047056 + 63600625 = 30084^2 + 7975^2 .

It is a cyclic number.

It is not a de Polignac number, because 968647681 - 2¹³ = 968639489 is a prime.

It is a super-2 number, since 2×968647681² = 1876556659813355522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (968647601) 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 in 3 ways as a sum of consecutive naturals, for example, 58356 + ... + 73093.

It is an arithmetic number, because the mean of its divisors is an integer number (242196625).

Almost surely, 2^968647681 is an apocalyptic number.

It is an amenable number.

968647681 is a deficient number, since it is larger than the sum of its proper divisors (138819).

968647681 is a wasteful number, since it uses less digits than its factorization.

968647681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138818.

The product of its digits is 3483648, while the sum is 55.

The square root of 968647681 is about 31123.1052595977. The cubic root of 968647681 is about 989.4380652786.

The spelling of 968647681 in words is "nine hundred sixty-eight million, six hundred forty-seven thousand, six hundred eighty-one".