691814 has 4 divisors (see below), whose sum is σ = 1037724. Its totient is φ = 345906.

The previous prime is 691813. The next prime is 691829. The reversal of 691814 is 418196.

691814 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 super-2 number, since 2×691814² = 957213221192, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691814.

It is not an unprimeable number, because it can be changed into a prime (691813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172952 + ... + 172955.

It is an arithmetic number, because the mean of its divisors is an integer number (259431).

2⁶⁹¹⁸¹⁴ is an apocalyptic number.

691814 is a deficient number, since it is larger than the sum of its proper divisors (345910).

691814 is a wasteful number, since it uses less digits than its factorization.

691814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345909.

The product of its digits is 1728, while the sum is 29.

The square root of 691814 is about 831.7535692740. The cubic root of 691814 is about 88.4429287207.

The spelling of 691814 in words is "six hundred ninety-one thousand, eight hundred fourteen".