603691 has 4 divisors (see below), whose sum is σ = 658584. Its totient is φ = 548800.

The previous prime is 603689. The next prime is 603719. The reversal of 603691 is 196306.

603691 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 603691 - 2¹ = 603689 is a prime.

It is a Duffinian number.

603691 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (603641) 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, 27430 + ... + 27451.

It is an arithmetic number, because the mean of its divisors is an integer number (164646).

2⁶⁰³⁶⁹¹ is an apocalyptic number.

603691 is a deficient number, since it is larger than the sum of its proper divisors (54893).

603691 is a wasteful number, since it uses less digits than its factorization.

603691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54892.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 603691 is about 776.9755465908. The cubic root of 603691 is about 84.5158636463.

Adding to 603691 its reverse (196306), we get a palindrome (799997).

The spelling of 603691 in words is "six hundred three thousand, six hundred ninety-one".