691318 has 4 divisors (see below), whose sum is σ = 1036980. Its totient is φ = 345658.

The previous prime is 691309. The next prime is 691333. The reversal of 691318 is 813196.

It is a happy number.

691318 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

691318 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172828 + ... + 172831.

It is an arithmetic number, because the mean of its divisors is an integer number (259245).

2⁶⁹¹³¹⁸ is an apocalyptic number.

691318 is a deficient number, since it is larger than the sum of its proper divisors (345662).

691318 is a wasteful number, since it uses less digits than its factorization.

691318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345661.

The product of its digits is 1296, while the sum is 28.

The square root of 691318 is about 831.4553505751. The cubic root of 691318 is about 88.4217871130.

The spelling of 691318 in words is "six hundred ninety-one thousand, three hundred eighteen".