691000349 has 4 divisors (see below), whose sum is σ = 744154236. Its totient is φ = 637846464.

The previous prime is 691000333. The next prime is 691000369. The reversal of 691000349 is 943000196.

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

It can be written as a sum of positive squares in 2 ways, for example, as 165765625 + 525234724 = 12875^2 + 22918^2 .

It is a cyclic number.

It is not a de Polignac number, because 691000349 - 2⁴ = 691000333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691000369) 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, 26576924 + ... + 26576949.

It is an arithmetic number, because the mean of its divisors is an integer number (186038559).

Almost surely, 2^691000349 is an apocalyptic number.

It is an amenable number.

691000349 is a deficient number, since it is larger than the sum of its proper divisors (53153887).

691000349 is a wasteful number, since it uses less digits than its factorization.

691000349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53153886.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 691000349 is about 26286.8854944818. The cubic root of 691000349 is about 884.0824217800.

The spelling of 691000349 in words is "six hundred ninety-one million, three hundred forty-nine", and thus it is an aban number.