979791 has 4 divisors (see below), whose sum is σ = 1306392. Its totient is φ = 653192.

The previous prime is 979787. The next prime is 979807. The reversal of 979791 is 197979.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197979 = 3 ⋅65993.

It is a cyclic number.

It is not a de Polignac number, because 979791 - 2² = 979787 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (979291) 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, 163296 + ... + 163301.

It is an arithmetic number, because the mean of its divisors is an integer number (326598).

2⁹⁷⁹⁷⁹¹ is an apocalyptic number.

979791 is a deficient number, since it is larger than the sum of its proper divisors (326601).

979791 is a wasteful number, since it uses less digits than its factorization.

979791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326600.

The product of its digits is 35721, while the sum is 42.

The square root of 979791 is about 989.8439270915. The cubic root of 979791 is about 99.3217772042.

It can be divided in two parts, 979 and 791, that added together give a triangular number (1770 = T₅₉).

The spelling of 979791 in words is "nine hundred seventy-nine thousand, seven hundred ninety-one".