691329 has 8 divisors (see below), whose sum is σ = 933760. Its totient is φ = 454896.

The previous prime is 691309. The next prime is 691333. The reversal of 691329 is 923196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 691329 - 2⁵ = 691297 is a prime.

It is a Duffinian number.

691329 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 691296 and 691305.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691329.

It is not an unprimeable number, because it can be changed into a prime (691309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1222 + ... + 1695.

It is an arithmetic number, because the mean of its divisors is an integer number (116720).

2⁶⁹¹³²⁹ is an apocalyptic number.

It is an amenable number.

691329 is a deficient number, since it is larger than the sum of its proper divisors (242431).

691329 is a wasteful number, since it uses less digits than its factorization.

691329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999.

The product of its digits is 2916, while the sum is 30.

The square root of 691329 is about 831.4619654560. The cubic root of 691329 is about 88.4222560889.

The spelling of 691329 in words is "six hundred ninety-one thousand, three hundred twenty-nine".