691055 has 8 divisors (see below), whose sum is σ = 849744. Its totient is φ = 539200.

The previous prime is 691051. The next prime is 691063. The reversal of 691055 is 550196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 691055 - 2² = 691051 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691055.

It is not an unprimeable number, because it can be changed into a prime (691051) 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, 1481 + ... + 1890.

It is an arithmetic number, because the mean of its divisors is an integer number (106218).

2⁶⁹¹⁰⁵⁵ is an apocalyptic number.

691055 is a deficient number, since it is larger than the sum of its proper divisors (158689).

691055 is a wasteful number, since it uses less digits than its factorization.

691055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 691055 is about 831.2971791123. The cubic root of 691055 is about 88.4105728432.

The spelling of 691055 in words is "six hundred ninety-one thousand, fifty-five".