691049 has 8 divisors (see below), whose sum is σ = 747840. Its totient is φ = 636336.

The previous prime is 691037. The next prime is 691051. The reversal of 691049 is 940196.

691049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 691049 - 2⁸ = 690793 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691049.

It is not an unprimeable number, because it can be changed into a prime (691079) 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, 212 + ... + 1194.

It is an arithmetic number, because the mean of its divisors is an integer number (93480).

2⁶⁹¹⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

691049 is a deficient number, since it is larger than the sum of its proper divisors (56791).

691049 is a wasteful number, since it uses less digits than its factorization.

691049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 691049 is about 831.2935702867. The cubic root of 691049 is about 88.4103169712.

The spelling of 691049 in words is "six hundred ninety-one thousand, forty-nine".