643225 has 12 divisors (see below), whose sum is σ = 870480. Its totient is φ = 467600.

The previous prime is 643217. The next prime is 643231. The reversal of 643225 is 522346.

643225 = 88² + 89² + ... + 137².

It is a happy number.

It is not a de Polignac number, because 643225 - 2³ = 643217 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 643196 and 643205.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 895 + ... + 1444.

It is an arithmetic number, because the mean of its divisors is an integer number (72540).

2⁶⁴³²²⁵ is an apocalyptic number.

It is an amenable number.

643225 is a deficient number, since it is larger than the sum of its proper divisors (227255).

643225 is a wasteful number, since it uses less digits than its factorization.

643225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360 (or 2355 counting only the distinct ones).

The product of its digits is 1440, while the sum is 22.

The square root of 643225 is about 802.0130921625. The cubic root of 643225 is about 86.3218962238.

It can be divided in two parts, 643 and 225, that added together give a palindrome (868).

The spelling of 643225 in words is "six hundred forty-three thousand, two hundred twenty-five".