691027 has 4 divisors (see below), whose sum is σ = 697840. Its totient is φ = 684216.

The previous prime is 691001. The next prime is 691037. The reversal of 691027 is 720196.

691027 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 691027 - 2¹¹ = 688979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690992 and 691010.

It is not an unprimeable number, because it can be changed into a prime (691037) 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, 3252 + ... + 3457.

It is an arithmetic number, because the mean of its divisors is an integer number (174460).

2⁶⁹¹⁰²⁷ is an apocalyptic number.

691027 is a deficient number, since it is larger than the sum of its proper divisors (6813).

691027 is a wasteful number, since it uses less digits than its factorization.

691027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6812.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 691027 is about 831.2803377923. The cubic root of 691027 is about 88.4093787610.

The spelling of 691027 in words is "six hundred ninety-one thousand, twenty-seven".