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656231 = 1076133
BaseRepresentation
bin10100000001101100111
31020100011212
42200031213
5131444411
622022035
75402132
oct2401547
91210155
10656231
11409044
1227791b
1319c904
14131219
15ce68b
hexa0367

656231 has 4 divisors (see below), whose sum is σ = 662472. Its totient is φ = 649992.

The previous prime is 656221. The next prime is 656237. The reversal of 656231 is 132656.

Adding to 656231 its reverse (132656), we get a palindrome (788887).

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-656231 is a prime.

It is a super-2 number, since 2×6562312 = 861278250722, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6 + 57 + 2 + 66 + 312 + 1 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 656197 and 656206.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 656231.

It is not an unprimeable number, because it can be changed into a prime (656237) 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, 2960 + ... + 3173.

It is an arithmetic number, because the mean of its divisors is an integer number (165618).

2656231 is an apocalyptic number.

656231 is a deficient number, since it is larger than the sum of its proper divisors (6241).

656231 is a wasteful number, since it uses less digits than its factorization.

656231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6240.

The product of its digits is 1080, while the sum is 23.

The square root of 656231 is about 810.0808601615. The cubic root of 656231 is about 86.8998274537.

The spelling of 656231 in words is "six hundred fifty-six thousand, two hundred thirty-one".

Divisors: 1 107 6133 656231