691117 has 4 divisors (see below), whose sum is σ = 789856. Its totient is φ = 592380.

The previous prime is 691111. The next prime is 691121. The reversal of 691117 is 711196.

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 691117 - 2³ = 691109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691091 and 691100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49359 + ... + 49372.

It is an arithmetic number, because the mean of its divisors is an integer number (197464).

2⁶⁹¹¹¹⁷ is an apocalyptic number.

It is an amenable number.

691117 is a deficient number, since it is larger than the sum of its proper divisors (98739).

691117 is an equidigital number, since it uses as much as digits as its factorization.

691117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98738.

The product of its digits is 378, while the sum is 25.

The square root of 691117 is about 831.3344693924. The cubic root of 691117 is about 88.4132167677.

It can be divided in two parts, 691 and 117, that added together give a palindrome (808).

The spelling of 691117 in words is "six hundred ninety-one thousand, one hundred seventeen".