979667681 has 4 divisors (see below), whose sum is σ = 1022261952. Its totient is φ = 937073412.

The previous prime is 979667669. The next prime is 979667723. The reversal of 979667681 is 186766979.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 979667681 - 2⁶ = 979667617 is a prime.

It is a super-2 number, since 2×979667681² = 1919497530391835522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 979667681.

It is not an unprimeable number, because it can be changed into a prime (979667621) 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, 21297101 + ... + 21297146.

It is an arithmetic number, because the mean of its divisors is an integer number (255565488).

Almost surely, 2^979667681 is an apocalyptic number.

It is an amenable number.

979667681 is a deficient number, since it is larger than the sum of its proper divisors (42594271).

979667681 is a wasteful number, since it uses less digits than its factorization.

979667681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42594270.

The product of its digits is 6858432, while the sum is 59.

The square root of 979667681 is about 31299.6434644230. The cubic root of 979667681 is about 993.1761006507.

It can be divided in two parts, 9796 and 67681, that added together give a palindrome (77477).

The spelling of 979667681 in words is "nine hundred seventy-nine million, six hundred sixty-seven thousand, six hundred eighty-one".