609491 has 4 divisors (see below), whose sum is σ = 629184. Its totient is φ = 589800.

The previous prime is 609487. The next prime is 609503. The reversal of 609491 is 194906.

609491 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, and also an emirpimes, since its reverse is a distinct semiprime: 194906 = 2 ⋅97453.

It is a cyclic number.

It is not a de Polignac number, because 609491 - 2² = 609487 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609421) 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, 9800 + ... + 9861.

It is an arithmetic number, because the mean of its divisors is an integer number (157296).

2⁶⁰⁹⁴⁹¹ is an apocalyptic number.

609491 is a deficient number, since it is larger than the sum of its proper divisors (19693).

609491 is a wasteful number, since it uses less digits than its factorization.

609491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19692.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 609491 is about 780.6990457276. The cubic root of 609491 is about 84.7856652968.

The spelling of 609491 in words is "six hundred nine thousand, four hundred ninety-one".