655851 has 8 divisors (see below), whose sum is σ = 999424. Its totient is φ = 374760.

The previous prime is 655849. The next prime is 655859. The reversal of 655851 is 158556.

It is a happy number.

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

It is not a de Polignac number, because 655851 - 2¹ = 655849 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655851.

It is not an unprimeable number, because it can be changed into a prime (655859) 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, 15595 + ... + 15636.

It is an arithmetic number, because the mean of its divisors is an integer number (124928).

2⁶⁵⁵⁸⁵¹ is an apocalyptic number.

655851 is a deficient number, since it is larger than the sum of its proper divisors (343573).

655851 is a wasteful number, since it uses less digits than its factorization.

655851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31241.

The product of its digits is 6000, while the sum is 30.

The square root of 655851 is about 809.8462817103. The cubic root of 655851 is about 86.8830506833.

The spelling of 655851 in words is "six hundred fifty-five thousand, eight hundred fifty-one".