691043043 has 16 divisors (see below), whose sum is σ = 948037376. Its totient is φ = 447418080.

The previous prime is 691043033. The next prime is 691043051. The reversal of 691043043 is 340340196.

691043043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 691043043 - 2¹⁰ = 691042019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 691043043.

It is not an unprimeable number, because it can be changed into a prime (691043033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57930 + ... + 68832.

It is an arithmetic number, because the mean of its divisors is an integer number (59252336).

Almost surely, 2^691043043 is an apocalyptic number.

691043043 is a deficient number, since it is larger than the sum of its proper divisors (256994333).

691043043 is a wasteful number, since it uses less digits than its factorization.

691043043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11514.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 691043043 is about 26287.6975598853. The cubic root of 691043043 is about 884.1006293142.

The spelling of 691043043 in words is "six hundred ninety-one million, forty-three thousand, forty-three".