979681 has 4 divisors (see below), whose sum is σ = 984852. Its totient is φ = 974512.

The previous prime is 979651. The next prime is 979691. The reversal of 979681 is 186979.

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 839056 + 140625 = 916^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 979681 - 2⁷ = 979553 is a prime.

It is a super-2 number, since 2×979681² = 1919549723522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

979681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (979651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2290 + ... + 2683.

It is an arithmetic number, because the mean of its divisors is an integer number (246213).

2⁹⁷⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

979681 is a deficient number, since it is larger than the sum of its proper divisors (5171).

979681 is a wasteful number, since it uses less digits than its factorization.

979681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5170.

The product of its digits is 27216, while the sum is 40.

The square root of 979681 is about 989.7883612167. The cubic root of 979681 is about 99.3180601515.

It can be divided in two parts, 97968 and 1, that added together give a square (97969 = 313²).

The spelling of 979681 in words is "nine hundred seventy-nine thousand, six hundred eighty-one".