601691 has 4 divisors (see below), whose sum is σ = 607992. Its totient is φ = 595392.

The previous prime is 601687. The next prime is 601697. The reversal of 601691 is 196106.

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 601691 - 2² = 601687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (601697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3005 + ... + 3198.

It is an arithmetic number, because the mean of its divisors is an integer number (151998).

2⁶⁰¹⁶⁹¹ is an apocalyptic number.

601691 is a deficient number, since it is larger than the sum of its proper divisors (6301).

601691 is an equidigital number, since it uses as much as digits as its factorization.

601691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6300.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 601691 is about 775.6874370518. The cubic root of 601691 is about 84.4224280220.

Adding to 601691 its reverse (196106), we get a palindrome (797797).

The spelling of 601691 in words is "six hundred one thousand, six hundred ninety-one".