679591 has 4 divisors (see below), whose sum is σ = 741384. Its totient is φ = 617800.

The previous prime is 679561. The next prime is 679597. The reversal of 679591 is 195976.

679591 = T₃₄₆ + T₃₄₇ + ... + T₃₅₆.

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

It is a cyclic number.

It is not a de Polignac number, because 679591 - 2⁷ = 679463 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6⁶ + 7⁵ + 5⁷ + 9⁴ + 9⁶ + 1 .

It is a Duffinian number.

679591 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 679591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679597) 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, 30880 + ... + 30901.

It is an arithmetic number, because the mean of its divisors is an integer number (185346).

2⁶⁷⁹⁵⁹¹ is an apocalyptic number.

679591 is a deficient number, since it is larger than the sum of its proper divisors (61793).

679591 is a wasteful number, since it uses less digits than its factorization.

679591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61792.

The product of its digits is 17010, while the sum is 37.

The square root of 679591 is about 824.3730951456. The cubic root of 679591 is about 87.9189594824.

It can be divided in two parts, 6795 and 91, that added together give a palindrome (6886).

The spelling of 679591 in words is "six hundred seventy-nine thousand, five hundred ninety-one".