691734289 has 4 divisors (see below), whose sum is σ = 692193600. Its totient is φ = 691274980.

The previous prime is 691734287. The next prime is 691734293. The reversal of 691734289 is 982437196.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 691734289 - 2¹ = 691734287 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691734283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227389 + ... + 230410.

It is an arithmetic number, because the mean of its divisors is an integer number (173048400).

Almost surely, 2^691734289 is an apocalyptic number.

It is an amenable number.

691734289 is a deficient number, since it is larger than the sum of its proper divisors (459311).

691734289 is a wasteful number, since it uses less digits than its factorization.

691734289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459310.

The product of its digits is 653184, while the sum is 49.

The square root of 691734289 is about 26300.8419827199. The cubic root of 691734289 is about 884.3953178399.

The spelling of 691734289 in words is "six hundred ninety-one million, seven hundred thirty-four thousand, two hundred eighty-nine".