691406329 has 8 divisors (see below), whose sum is σ = 711036648. Its totient is φ = 671907840.

The previous prime is 691406311. The next prime is 691406363. The reversal of 691406329 is 923604196.

691406329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 354757225 + 336649104 = 18835^2 + 18348^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 691406329 - 2¹³ = 691398137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691406291 and 691406300.

It is not an unprimeable number, because it can be changed into a prime (691406399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22272 + ... + 43345.

It is an arithmetic number, because the mean of its divisors is an integer number (88879581).

Almost surely, 2^691406329 is an apocalyptic number.

It is an amenable number.

691406329 is a deficient number, since it is larger than the sum of its proper divisors (19630319).

691406329 is a wasteful number, since it uses less digits than its factorization.

691406329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65915.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 691406329 is about 26294.6064621625. The cubic root of 691406329 is about 884.2555280664.

The spelling of 691406329 in words is "six hundred ninety-one million, four hundred six thousand, three hundred twenty-nine".