655491 has 8 divisors (see below), whose sum is σ = 880384. Its totient is φ = 433800.

The previous prime is 655489. The next prime is 655507. The reversal of 655491 is 194556.

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

It is not a de Polignac number, because 655491 - 2¹ = 655489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271 + ... + 1176.

It is an arithmetic number, because the mean of its divisors is an integer number (110048).

2⁶⁵⁵⁴⁹¹ is an apocalyptic number.

655491 is a deficient number, since it is larger than the sum of its proper divisors (224893).

655491 is a wasteful number, since it uses less digits than its factorization.

655491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601.

The product of its digits is 5400, while the sum is 30.

The square root of 655491 is about 809.6239867988. The cubic root of 655491 is about 86.8671509221.

The spelling of 655491 in words is "six hundred fifty-five thousand, four hundred ninety-one".