691247041 has 8 divisors (see below), whose sum is σ = 706556520. Its totient is φ = 676021632.

The previous prime is 691246981. The next prime is 691247093. The reversal of 691247041 is 140742196.

691247041 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 1081600 + 690165441 = 1040^2 + 26271^2 .

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 691247041 - 2¹¹ = 691244993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691246988 and 691247006.

It is not an unprimeable number, because it can be changed into a prime (691247441) 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, 4246 + ... + 37423.

It is an arithmetic number, because the mean of its divisors is an integer number (88319565).

Almost surely, 2^691247041 is an apocalyptic number.

It is an amenable number.

691247041 is a deficient number, since it is larger than the sum of its proper divisors (15309479).

691247041 is a wasteful number, since it uses less digits than its factorization.

691247041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42035.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 691247041 is about 26291.5773775557. The cubic root of 691247041 is about 884.1876171499.

The spelling of 691247041 in words is "six hundred ninety-one million, two hundred forty-seven thousand, forty-one".