655231 has 4 divisors (see below), whose sum is σ = 693792. Its totient is φ = 616672.

The previous prime is 655229. The next prime is 655241. The reversal of 655231 is 132556.

It is a happy number.

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 655231 - 2¹ = 655229 is a prime.

It is a super-2 number, since 2×655231² = 858655326722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19255 + ... + 19288.

It is an arithmetic number, because the mean of its divisors is an integer number (173448).

2⁶⁵⁵²³¹ is an apocalyptic number.

655231 is a deficient number, since it is larger than the sum of its proper divisors (38561).

655231 is a wasteful number, since it uses less digits than its factorization.

655231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38560.

The product of its digits is 900, while the sum is 22.

The square root of 655231 is about 809.4634025081. The cubic root of 655231 is about 86.8556641404.

Adding to 655231 its reverse (132556), we get a palindrome (787787).

The spelling of 655231 in words is "six hundred fifty-five thousand, two hundred thirty-one".