691347 has 4 divisors (see below), whose sum is σ = 921800. Its totient is φ = 460896.

The previous prime is 691343. The next prime is 691349. The reversal of 691347 is 743196.

It is a happy number.

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

It is not a de Polignac number, because 691347 - 2² = 691343 is a prime.

It is a D-number.

It is a Duffinian number.

691347 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691347.

It is not an unprimeable number, because it can be changed into a prime (691343) 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, 115222 + ... + 115227.

It is an arithmetic number, because the mean of its divisors is an integer number (230450).

2⁶⁹¹³⁴⁷ is an apocalyptic number.

691347 is a deficient number, since it is larger than the sum of its proper divisors (230453).

691347 is a wasteful number, since it uses less digits than its factorization.

691347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230452.

The product of its digits is 4536, while the sum is 30.

The square root of 691347 is about 831.4727896931. The cubic root of 691347 is about 88.4230234933.

The spelling of 691347 in words is "six hundred ninety-one thousand, three hundred forty-seven".