605691 has 8 divisors (see below), whose sum is σ = 897360. Its totient is φ = 403776.

The previous prime is 605687. The next prime is 605707. The reversal of 605691 is 196506.

It is not a de Polignac number, because 605691 - 2² = 605687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 22433 = 605691 / (6 + 0 + 5 + 6 + 9 + 1).

It is not an unprimeable number, because it can be changed into a prime (605641) 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, 11190 + ... + 11243.

It is an arithmetic number, because the mean of its divisors is an integer number (112170).

2⁶⁰⁵⁶⁹¹ is an apocalyptic number.

605691 is a deficient number, since it is larger than the sum of its proper divisors (291669).

605691 is a wasteful number, since it uses less digits than its factorization.

605691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22442 (or 22436 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 605691 is about 778.2615241678. The cubic root of 605691 is about 84.6090931326.

It can be divided in two parts, 605 and 691, that added together give a 4-th power (1296 = 6⁴).

The spelling of 605691 in words is "six hundred five thousand, six hundred ninety-one".